Research Journal Entry 11

When the Numbers Say “Not Yet”

One of the principles behind Beyond the Light Barrier is simple:

A compelling idea receives permission to be investigated—not permission to be believed.

This part of the research put that principle to a fairly serious test.

For some time, one branch of the project has investigated whether rotating masses might provide a useful laboratory-scale precursor for measuring extremely small spacetime effects.

The idea was not that spinning rotors would somehow create a warp drive.

The more modest question was whether a controlled rotating source could produce a predicted weak-field relativistic effect that could be measured with sufficiently sensitive instrumentation.

If so, it might provide a useful experimental platform for learning how to detect and control extremely small spacetime-related signals.

After progressively improving the calculations, however, we reached a different conclusion.

The particular historical-scale rotating-source architecture we investigated is not presently a credible near-term experiment.

That is a negative result.

And it is worth documenting.

Starting With a Physical Source

The precursor research began with rotating masses.

General relativity predicts that rotating mass contributes to gravitomagnetic effects associated with frame dragging.

That underlying physics is not a Beyond the Light Barrier hypothesis. It belongs to established relativistic theory.

What was exploratory was the engineering question:

Could a laboratory rotating-mass system produce a useful measurable signal?

Early work examined simplified rotating sources, including approximately 10-kilogram rotors operating around 100 Hz.

The calculations were progressively checked and improved.

Thin-ring models were followed by finite-volume source calculations.

Those calculations taught us something important: near a rotating source, the detailed distribution of moving mass matters. Total angular momentum alone is not enough to describe the complete local spatial pattern.

But improving the source model did not solve the larger problem.

Connecting the Source to a Detector

Knowing that a source produces a theoretically predicted field is not enough.

An experiment needs a detector.

So the next stage connected the rotating-source calculation to a specific candidate measurement using atom interferometry.

For a defined reference geometry involving two approximately 10-kilogram, 100-Hz effective-ring rotors and rubidium-87 atoms, the numerical calculation produced a predicted phase of approximately:

Δφ ≈ 1.10 × 10⁻¹⁶ rad

This is a computational result for that specified model and geometry.

It is not an experimental measurement.

It is not evidence of anomalous gravity.

And it is not evidence of a warp effect.

It tells us what the specified weak-field model predicts the detector response should be.

Then Came the Important Question

Once we had a predicted detector response, the research question changed.

It was no longer simply:

Can we calculate a signal?

It became:

Could we realistically measure it?

The predicted phase was translated into a conventional atom-interferometer acceleration-equivalent comparison scale.

For an interrogation time of 0.05 seconds, that scale was approximately:

2.74 × 10⁻²¹ m/s²

This number is useful for comparing scales, but it should not be misunderstood as saying that the modeled effect is simply a uniform acceleration.

The comparison exposed the central problem.

The predicted signal was extraordinarily small relative to realistic detector sensitivity.

Simply collecting data for a longer time did not appear to provide a credible solution to the gap.

Can We Make the Signal Bigger?

That led naturally to another question.

Perhaps the original source was simply too conservative.

Could we increase the mass?

Spin the rotors faster?

Move the detector closer?

Increase the atom-interferometer interrogation time?

Use improved atom optics?

At first, several of those possibilities appear promising when considered independently.

But engineering systems do not allow every favorable scaling factor to be multiplied together without consequences.

Moving closer to the source can increase the desired relativistic signal, but ordinary Newtonian gravitational gradients also become stronger.

Increasing source mass strengthens both the desired signal and conventional gravity.

Increasing rotor speed introduces material-strength, stored-energy, balance, vibration, bearing, and containment problems.

Increasing detector sensitivity can introduce additional systematic-error requirements.

The variables are coupled.

So the project stopped treating maximum theoretical phase as the sole objective.

The Material Limit Matters

A later screening calculation replaced an earlier optimistic assumption about dramatically increasing rotor angular momentum with constraints based on representative flywheel material strength and density.

Under the simplified screening assumptions, including a safety factor of two, representative material classes suggested roughly a 5–14× first-order improvement in rotor tip speed and angular-momentum scaling relative to the 100-Hz, 0.10-meter baseline.

That is potentially useful.

But it is very different from simply assuming a hundredfold improvement.

Detector improvements such as longer coherence times and large-momentum-transfer atom optics also remain scientifically interesting.

However, those gains cannot responsibly be multiplied together until a compatible detector model and systematic-error analysis demonstrate that they can actually operate together.

Following the Whole Chain

The research had now followed the architecture through a much more complete chain:

source prediction → detector response → sensitivity comparison → scaling analysis → coupled constraints → material-limited screening

The result was increasingly difficult to avoid.

Retiring the Near-Term Architecture

The current research decision is therefore:

Retire the historical approximately 10-kilogram-class rotating-source architecture as a near-term physical precursor.

That statement is deliberately narrow.

We are not saying that gravitomagnetism is wrong.

We are not saying that frame dragging does not exist.

We are not saying that atom interferometry cannot measure extremely small effects.

We are not saying that every possible rotating-source experiment is useless.

And we certainly have not demonstrated that advanced propulsion or faster-than-light travel is impossible.

What the analysis constrains is one particular experimental architecture at approximately the scale investigated.

The predicted signal is presently too small, and the realistic scaling opportunities identified so far do not provide enough justification to move directly into hardware construction.

Why This Is a Useful Result

It would have been easy to keep adjusting assumptions until the numbers became more exciting.

That would also have weakened the research.

Instead, the negative result tells us something useful about the search space.

We now know more about:

• how finite rotating-source geometry affects the predicted near field;
• why angular momentum alone is not enough to optimize the detector response;
• how source predictions must be connected to an explicit detector;
• how extraordinarily small the predicted signal is for the investigated architecture;
• why conventional gravitational backgrounds matter;
• why engineering gains cannot simply be multiplied independently;
• and where material constraints begin limiting rotor scaling.

Those lessons survive even though the proposed near-term experiment does not.

Could the Idea Ever Be Reopened?

Yes—but there should be a quantitative reason.

The architecture could become worth reconsidering if future developments change the relevant landscape by multiple orders of magnitude.

Examples might include substantially improved demonstrated detector sensitivity, a stronger rigorously derived detector coupling, much greater safely achievable specific angular momentum, or a credible differential or modulation technique that suppresses conventional source-synchronous backgrounds.

Until something like that occurs, continuing to optimize this particular architecture would probably consume research effort without addressing its dominant limitation.

Where the Project Goes Next

This result helps clarify the next phase of Beyond the Light Barrier.

The historical reconstruction work is largely complete for the material presently available.

The project is moving increasingly toward verification, reproducibility, detector credibility, and research questions that can survive quantitative gates.

For the communication work, physical source generation remains a major problem.

For advanced propulsion, desirable spacetime geometries still have to be connected to physically realizable sources, stability, control, and causality.

And for precursor experiments, a compelling concept is no longer enough to justify construction.

We need a chain that survives:

physical source → predicted spacetime effect → detector response → measurable observable → controls → uncertainty → independent reproduction → experiment

If that chain breaks, we need to know where it broke.

Sometimes that means improving the model.

Sometimes it means improving the experiment.

And sometimes it means putting an idea aside.

That isn't the research stopping.

That is the research working.

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Research Status

Current status: The historical approximately 10-kilogram-class NP rotating-source architecture has been retired as a near-term physical precursor following detector-sensitivity, scaling, coupled-constraint, and material-limited screening.

The project has not experimentally detected an anomalous gravitational effect, engineered spacetime, warp propulsion, faster-than-light communication, or faster-than-light travel.

The calculations discussed in this entry consist of analytic, numerical, and engineering screening work. They are not physical experimental results. No current Beyond the Light Barrier result qualifies as an independently reproduced Category 8 result or a Category 9 physical experimental result.

Sources & Further Reading

Beyond the Light Barrier — Research State v1.6
Internal project research-state record documenting the NP-2D through NP-2G verification sequence, detector-credibility analysis, scaling analysis, coupled-constraint gate, material-limited screening, and architecture retirement.

Beyond the Light Barrier — Verification Roadmap v1.0
Internal project roadmap defining the progression from analytic and computational results through independent reproduction, detector credibility, uncertainty analysis, and eventual physical experimentation.

The numerical values and architecture disposition described in this entry are Beyond the Light Barrier project results. They should not be interpreted as experimental measurements or as established evidence for anomalous gravity, engineered spacetime, or faster-than-light propulsion.

Research Explained 1

How Do You Test an Idea as Extraordinary as Wormhole Communication?

Wormholes are among the most fascinating possibilities to emerge from the mathematics of general relativity.

They are also very easy to misunderstand.

A mathematical solution is not the same thing as a physical object.

A computer model is not the same thing as an experiment.

And an unexplained signal would not automatically be evidence of a wormhole.

Those distinctions have become increasingly important as the Beyond the Light Barrier communication research has developed.

So this Research Explained article tackles a deceptively simple question:

How can we scientifically investigate something when we do not even know whether it can physically exist?

Start With What Physics Actually Says

General relativity describes gravity as the geometry of spacetime.

Under certain mathematical conditions, Einstein's equations permit geometries that connect otherwise separated regions of spacetime.

These are broadly associated with what we call wormholes.

But there is an enormous distance between saying that a geometry is mathematically describable and saying that nature contains a traversable version of it.

There is an even greater distance between that and saying humans could engineer one.

No experimentally verified traversable wormhole is known.

No experiment in the Beyond the Light Barrier project has produced one.

That gives us our starting point—not our conclusion.

Figure 1. Conceptual illustration of the research path from theoretical wormhole physics toward experimentally testable questions. This is an explanatory illustration, not a simulation result or physical experiment.

Five Different Levels of a Research Claim

It helps to separate the research into levels.

Level 1: Theory

Accepted physical theories provide the mathematical framework within which a possibility can be considered.

General relativity belongs here.

Level 2: Model

Researchers can choose a particular geometry, set of assumptions, or simplified physical system and ask what the equations predict.

A model can teach us a great deal.

But it remains a model.

Level 3: Prediction

The model may predict something measurable.

For communication research, that could involve signal transmission, frequency behavior, timing, attenuation, correlation, or another observable quantity.

This is where mathematics begins connecting with experimental science.

Level 4: Experiment

Now we build a physical system capable of testing a prediction.

The apparatus has to measure not only the effect we are looking for but also the ordinary physical mechanisms that might imitate it.

Level 5: Evidence

When physical measurements survive appropriate experimental controls, they can begin to provide experimental evidence for the specific effect actually tested.

Independent reproduction can then strengthen that evidence by testing whether the result survives different investigators, apparatus, implementations, or experimental conditions.

Even then, the evidence supports only what the experiments actually establish.

That hierarchy prevents an easy but serious mistake:

A result at one level should not be described as though it occurred at a higher level.

What Did the Communication Modeling Actually Tell Us?

One part of the Beyond the Light Barrier research has examined how candidate signals behave in simplified theoretical communication geometries.

This kind of analysis can answer useful questions.

For example:

• Does a modeled signal propagate through the assumed geometry?
• How does transmission depend on frequency?
• How does changing the characteristic size of the geometry change the result?
• Do different candidate information carriers behave differently?
• What conditions produce strong or weak modeled transmission?

Numerical analysis can help answer those questions within the assumptions of the model.

Within the Beyond the Light Barrier Research Method, numerical or simulation results belong to a different evidence category from independently reproduced results or physical experimental results. A successful calculation establishes what the specified model predicts under its stated assumptions and numerical conditions; it does not by itself establish that nature behaves that way.

But notice what it cannot tell us.

It cannot establish that the modeled geometry exists in nature.

It cannot establish that we can manufacture that geometry.

And it cannot establish that information has physically traveled through a wormhole.

The modeling tells us what follows if the assumptions of the model are true.

That is useful because it helps identify what an experiment would eventually need to measure.

Why the Research Started Getting Smaller

The original motivation for this research involves enormous distances.

Communication across the solar system—and eventually between stars—is severely limited by ordinary light-travel time.

But trying to begin an experiment across astronomical distances would make little sense.

For the Beyond the Light Barrier project, the experimental strategy is therefore to begin at the smallest practical controlled distance rather than assume that an unusual information-transfer mechanism, if one exists at all, must first be investigated across astronomical distances.

A repeatable laboratory-scale effect that survived rigorous controls would provide a scientifically testable result, while an elaborate proposal for communicating with another star would remain difficult to evaluate experimentally without an accessible precursor effect.

So the BTLB research question became smaller:

Can a controlled laboratory system produce a repeatable information correlation that cannot be explained by known communication paths?

That is a question an experiment can potentially answer.

Detecting a Signal Is the Easy Part

Imagine placing a transmitter on one side of a laboratory and a receiver on the other.

The transmitter sends a sequence of information.

The receiver detects the same sequence.

Have we discovered an exotic communication channel?

Almost certainly not.

There are many ordinary ways information could get from one side to the other.

• Electromagnetic radiation
• Electrical coupling
• Magnetic coupling
• Acoustic transmission
• Mechanical vibration
• Thermal effects
• Shared grounding
• Instrument cross-talk
• Software communication
• Timing errors

All of those explanations have to be taken seriously.

Figure 2. Conceptual illustration of a laboratory communication test and possible conventional paths by which a signal or correlation could appear at the receiver. This is an explanatory illustration, not an experimental apparatus, simulation result, or observed anomalous signal.

An Unexplained Signal Would Still Not Be a Wormhole

This is one of the most important ideas in the project.

Suppose an experiment eventually produced a repeatable correlation and every conventional explanation we had tested failed to account for it.

We still should not write:

We detected communication through a wormhole.

The defensible statement would be:

We observed a repeatable correlation that has not yet been explained by the conventional mechanisms tested.

Those sentences may sound similar.

Scientifically, they are enormously different.

The second statement leaves open the possibility that we overlooked an ordinary explanation.

And history gives us plenty of reasons to expect that possibility.

Try to Break the Result

If an unexplained effect appeared, the next job would not be to defend it.

The next job would be to try to destroy it.

Increase the shielding.

Move the equipment.

Change the distance.

Change the signal.

Disconnect unnecessary cables.

Use independent clocks.

Blind portions of the analysis.

Change instruments.

Repeat the experiment somewhere else.

Ask another group to reproduce it independently.

If the effect disappears, we have learned something.

If it survives, the result becomes more interesting.

Why Null Results Matter

There is another possible outcome.

Nothing unusual happens.

That result matters too.

A well-designed experiment that detects no anomalous correlation constrains the conditions under which such an effect could exist.

It may eliminate an experimental approach.

It may show that a theoretical assumption was not physically useful.

Or it may tell us that the sensitivity of the experiment needs to improve.

Scientific progress is not limited to discovering the thing we hoped to find.

Sometimes learning where something isn't is what allows the next experiment to become better.

So Are We Testing a Wormhole?

Not yet.

That is actually the point.

At the current stage, the communication research is developing models, identifying measurable quantities, and designing an experimental architecture capable of separating interesting correlations from ordinary physics.

The word wormhole describes one theoretical motivation for the research.

It should not predetermine the explanation for anything an experiment might eventually observe.

If the measurements ultimately show nothing unusual, that result belongs in the research record.

If they reveal ordinary coupling we failed to anticipate, that belongs in the record too.

And if someday a carefully controlled experiment produces a repeatable result that survives increasingly aggressive attempts to explain it conventionally, then we will have earned the right to ask a much more interesting question:

What physical mechanism produced it?

That is how an extraordinary idea gradually becomes a scientific question.

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Research Status

Current status: Exploratory theoretical and computational modeling, identification of predicted observables, and experimental architecture development.

• Evidence Category 7 — Numerical/simulation results: Computational results discussed in this research program describe the behavior of specified models under their stated assumptions and numerical conditions. They are not physical experimental results.
• Evidence Category 8 — Independently reproduced results: No independently reproduced physical communication result is reported in this article.
• Evidence Category 9 — Experimental results: No physical experiment reported here has demonstrated a traversable wormhole, engineered spacetime communication channel, faster-than-light information transfer, or anomalous communication mechanism.

The numerical, theoretical, and conceptual results discussed here describe model behavior, research methodology, and possible experimental strategies. They should not be interpreted as evidence that a physical wormhole or faster-than-light communication mechanism exists.

Sources & Further Reading

Albert Einstein and Nathan Rosen (1935)
“The Particle Problem in the General Theory of Relativity.”
Physical Review, 48, 73–77.
DOI: 10.1103/PhysRev.48.73

Michael S. Morris and Kip S. Thorne (1988)
“Wormholes in spacetime and their use for interstellar travel: A tool for teaching general relativity.”
American Journal of Physics, 56, 395–412.
DOI: 10.1119/1.15620

Michael S. Morris, Kip S. Thorne, and Ulvi Yurtsever (1988)
“Wormholes, Time Machines, and the Weak Energy Condition.”
Physical Review Letters, 61, 1446–1449.
DOI: 10.1103/PhysRevLett.61.1446

Matt Visser (1995)
Lorentzian Wormholes: From Einstein to Hawking.
American Institute of Physics.

Beyond the Light Barrier Research Method v1.1
Project research methodology governing the separation of established evidence, accepted physical theory, published speculative theory, project hypotheses, engineering concepts, analytic estimates, numerical and simulation results, independent reproduction, and physical experimental results.

These references establish theoretical background for wormhole geometries. The Beyond the Light Barrier modeling and experimental concepts discussed in this article are independent exploratory research and are not experimental results reported by these sources.

Research Journal Entry 10

Designing the First Communication Experiment

The previous Research Journal entry ended with a practical question:

What would the smallest credible communication experiment actually look like?

That question sounds as though it should lead immediately to a parts list.

It doesn't.

Before deciding what equipment to build, we first need to decide what the experiment must be capable of telling us.

That distinction is important.

An apparatus can produce interesting measurements while still being incapable of answering the question it was built to investigate.

What Are We Actually Testing?

The long-term question behind this part of the Beyond the Light Barrier project is whether information might somehow be transferred through an engineered spacetime connection.

But we do not currently know how to create such a connection.

We also have no experimental evidence from this project that a traversable wormhole, engineered spacetime communication channel, or faster-than-light information-transfer mechanism exists.

So our first laboratory experiment cannot reasonably be described as a test of a working wormhole.

The experimental question has to be narrower:

Can a carefully controlled transmitter and receiver produce a repeatable correlation that cannot be accounted for by known communication paths or experimental artifacts?

That question does not assume what the answer will be.

It also does not assume that an unexplained result, if one occurred, would be evidence of a wormhole.

It simply gives us something measurable.

The Simplest Architecture

At the highest level, the experiment needs two sides.

Side A: the transmitter.

This is where a controlled signal, excitation, or other experimental input would originate.

Side B: the receiver.

This is where instruments would look for a response correlated with the transmitted information.

Between them is the most important part of the experiment:

the controlled separation.

If an ordinary signal can simply leak from Side A to Side B, detecting that signal tells us very little.

The challenge therefore is not merely detecting something at the receiver.

The challenge is determining how it got there.

The Ordinary Paths Have to Be Taken Seriously

Suppose the transmitter changes state and, shortly afterward, the receiver registers a corresponding change.

That might initially look interesting.

But there are many ordinary explanations.

An electromagnetic signal could have leaked around the shielding.

A cable could provide an unintended electrical path.

Two instruments could share a ground connection.

A mechanical vibration could travel through the laboratory bench.

Temperature could change.

Software could inadvertently share information.

Two clocks could be synchronized incorrectly.

Or the apparent correlation could simply be statistical coincidence.

Every one of those explanations is more conventional than a new communication mechanism.

That means the experiment should be designed to find ordinary explanations rather than merely hoping they are absent.

Controls Are Part of the Experiment

A useful experimental design therefore needs more than a transmitter and receiver.

It needs controls.

For example, measurements could be repeated with the transmitter inactive.

They could be repeated with shielding changed.

The physical separation could be altered.

Dummy signals could be introduced.

The receiver analysis could sometimes be performed without knowing when the transmitter was active.

Different sensors could independently monitor electromagnetic, acoustic, thermal, and mechanical conditions.

If an apparent effect changes when one of these controls changes, that gives us information about its likely origin.

In many cases, discovering that an apparent anomaly has an ordinary explanation would be a successful experiment.

We would have learned what the apparatus was actually measuring.

Time Becomes Part of the Measurement

Communication is inherently connected to time.

If the transmitter changes at one moment and the receiver changes at another, we need to know those times accurately enough to compare them.

That means both sides of the experiment need a common or carefully characterized timebase.

The experimental record should eventually include synchronized instrument telemetry as well as synchronized video and, where useful, audio documentation.

Multiple camera views could record the overall apparatus, critical components, and instrument displays.

Those recordings would not replace scientific sensors.

They would provide an independent documentary record that could help correlate physical events with the telemetry and identify mundane disturbances that might otherwise be missed.

The Experiment Must Be Able to Say “No”

This may be the most important design requirement.

A credible experiment must be capable of producing a result that does not support the hypothesis.

If every possible measurement can be interpreted as evidence for the idea, then the experiment cannot really test the idea.

For this project, a perfectly legitimate result would be:

No statistically meaningful correlation was detected beyond the behavior expected from known coupling, noise, and measurement uncertainty.

Another legitimate result would be:

An apparent correlation was detected, but subsequent controls identified ordinary electromagnetic coupling as its source.

Neither result would be a failure of the research.

Both would constrain what we should try next.

What Would an Interesting Result Look Like?

Now consider the opposite possibility.

Suppose a repeatable correlation remained after known electromagnetic, electrical, acoustic, mechanical, thermal, software, and timing paths had been investigated.

That still would not establish a wormhole.

It would not establish faster-than-light communication.

And it would not establish new physics.

It would establish something much more modest:

The experiment has produced a repeatable observation that the present controls have not yet explained.

The correct response would then be to strengthen the controls, reproduce the result, change the apparatus, and invite independent attempts to find the missing explanation.

Extraordinary interpretations should come last, not first.

From Architecture to Hardware

We are now one step closer to an actual experiment.

We can describe its basic architecture:

• a controlled transmitter,
• an independently monitored receiver,
• a carefully characterized separation between them,
• sensors for ordinary environmental and coupling mechanisms,
• a synchronized timing system,
• a synchronized experimental record,
• control runs,
• and predefined criteria for evaluating the result.

But we still have not answered an important engineering question.

What physical system should we actually build?

That is where the research becomes more concrete.

Instead of starting with exotic hardware and asking what it might do, we can work backward from the measurement we need and determine what components would be required to make that measurement credibly.

That will be the next step.

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Research Status

Current status: Experimental architecture development based on exploratory theoretical and engineering research.

No physical experiment described here has demonstrated a wormhole, engineered spacetime communication, faster-than-light information transfer, or any other anomalous communication mechanism. The architecture described in this entry establishes requirements for a future controlled experiment rather than reporting experimental results.

Sources & Further Reading

Michael S. Morris and Kip S. Thorne (1988)
“Wormholes in spacetime and their use for interstellar travel: A tool for teaching general relativity.”
American Journal of Physics, 56, 395–412.
DOI: 10.1119/1.15620

Michael S. Morris, Kip S. Thorne, and Ulvi Yurtsever (1988)
“Wormholes, Time Machines, and the Weak Energy Condition.”
Physical Review Letters, 61, 1446–1449.
DOI: 10.1103/PhysRevLett.61.1446

National Institute of Standards and Technology
Time and Frequency Division.
Background information on precision timing and measurement.

National Institute of Standards and Technology
Measurement Science.
Background on measurement, standards, calibration, and uncertainty.

The wormhole references above describe theoretical work in general relativity. The experimental architecture discussed in this journal entry is a Beyond the Light Barrier research concept and should not be interpreted as an apparatus established by those publications or as evidence that traversable wormholes can be engineered.

Research Journal Entry 9

From a Wormhole Idea to a Testable Communication Question

One of the most important transitions in this research has been learning to separate an interesting idea from a testable question.

A wormhole is an extraordinary idea.

But an extraordinary idea is not yet an experiment.

In the previous Research Journal entry, I asked what kind of information carrier we should consider sending through a hypothetical wormhole communication system.

That led naturally to another question:

What could we actually test?

The Difference Between a Concept and an Experiment

The communication project began with a very large possibility:

Could two distant locations somehow be connected through spacetime in a way that allows information to travel between them more directly?

General relativity admits mathematical spacetime geometries commonly described as wormholes. But that does not mean that traversable wormholes are known to exist, that they can be engineered, or that information can actually be transmitted through one.

Those are very different claims.

So the project cannot begin by assuming that a wormhole communication device is possible.

Instead, the research needs to move toward smaller questions whose answers could eventually be compared with observation or experiment.

Start Small

For communication, the first useful experiment would not need to span planets, stars, or even kilometers.

If an unusual communication mechanism exists, demonstrating it across a very small controlled distance would already be scientifically significant.

That changes the engineering question.

Instead of asking:

How do we communicate with another star?

we can ask:

Can a controlled laboratory system produce any measurable information-transfer behavior that cannot be explained by ordinary propagation?

That is a much more useful research question.

Ordinary Physics Is the Baseline

Any experiment would first have to account for ordinary ways that a signal could travel between the transmitter and receiver.

Depending on the experiment, those could include:

• intended or unintended radio-frequency and electromagnetic radiation,
• electrical coupling,
• magnetic coupling,
• acoustic or mechanical vibration,
• thermal effects,
• instrument cross-talk,
• software or timing errors,
• and other conventional signal leakage or environmental coupling.

This means that simply detecting a signal at the receiver would not demonstrate anything unusual.

The experiment would have to be designed so that conventional explanations could be identified, measured, and progressively eliminated.

A Null Result Matters

There is another important principle that I want this project to maintain.

The experiment must be allowed to fail.

If the apparatus produces no anomalous communication effect, that result should be recorded.

If an apparent effect disappears after better electromagnetic shielding is installed, that should also be recorded.

If a signal turns out to be caused by vibration, timing drift, software behavior, or ordinary electromagnetic propagation, that explanation should replace the more interesting one.

A research program that only accepts exciting results is not really testing its hypothesis.

What Would Count as Interesting?

At this stage, we are not defining an observation as evidence of a wormhole.

That standard would be far too strong.

A more appropriate question is:

What observation would justify another experiment?

An interesting result might be a repeatable correlation between transmitter and receiver that survives increasingly strong controls against known communication paths.

Even then, the first conclusion should not be:

We found a wormhole.

It should be:

We observed something that our present controls have not yet explained.

That distinction is fundamental to the research method of this project.

From Theory Toward Apparatus

This is where the communication project is beginning to change.

Earlier work concentrated heavily on theoretical possibilities: spacetime geometry, minimum throat scales, field propagation, transmission behavior, and possible information carriers.

Those questions remain important.

But the next stage must increasingly connect the mathematics to things that could eventually be built and measured.

That means asking questions such as:

• What physical quantity would we attempt to manipulate?
• What would generate that condition?
• What would serve as the transmitter?
• What would serve as the receiver?
• What instruments would measure the experiment?
• What conventional signal paths must be eliminated?
• What controls would distinguish an interesting result from ordinary coupling?
• What quantitative criteria would define a candidate signal before the experiment is performed?
• Could source conditions or portions of the analysis be randomized or blinded to reduce observer and analysis bias?
• And what observation would tell us to stop pursuing a particular approach?

Those questions begin turning speculative research into experimental design.

What We Have — and What We Do Not Have

It is important to be precise about the current state of the project.

We have not demonstrated a wormhole.

We have not demonstrated faster-than-light communication.

We have not demonstrated that an engineered spacetime communication channel is physically possible.

What we do have is a developing framework for asking progressively more constrained questions about those possibilities.

That may sound less dramatic.

But scientifically, it is much more useful.

The Next Question

The project began with enormous distances.

It is now moving in the opposite direction.

Before asking whether information could cross the solar system or travel between stars through an engineered spacetime geometry, we should ask whether there is anything measurable at laboratory scale.

That leads to the next stage of the research:

What would the smallest credible communication experiment actually look like?

That question will move us another step from possibility toward something that can eventually confront reality.

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Research Status

Current status: Exploratory theoretical and engineering research.

No experimental evidence currently produced by this project demonstrates traversable wormholes, engineered spacetime communication, or faster-than-light information transfer.

Sources & Further Reading

Albert Einstein and Nathan Rosen (1935)
“The Particle Problem in the General Theory of Relativity.”
Physical Review, 48, 73–77.
DOI: 10.1103/PhysRev.48.73

Michael S. Morris and Kip S. Thorne (1988)
“Wormholes in spacetime and their use for interstellar travel: A tool for teaching general relativity.”
American Journal of Physics, 56, 395–412.
DOI: 10.1119/1.15620

Michael S. Morris, Kip S. Thorne, and Ulvi Yurtsever (1988)
“Wormholes, Time Machines, and the Weak Energy Condition.”
Physical Review Letters, 61, 1446–1449.
DOI: 10.1103/PhysRevLett.61.1446

Matt Visser (1995)
Lorentzian Wormholes: From Einstein to Hawking.
American Institute of Physics.

These references provide background on general relativity and theoretical wormhole geometries. Their inclusion does not imply that experimentally realizable traversable wormholes or faster-than-light communication have been demonstrated.

Research Journal Entry 8

What Should We Send Through a Wormhole?

One of the easiest assumptions to make when thinking about communication is that the signal comes after the communication channel.

Build the channel first.

Then decide what to send through it.

That assumption may not work for wormhole communication.

In the previous stage of the Wormhole Communication project, we developed WC-MGT-1: a Minimum Geometry Throat model intended to ask how little spacetime geometry might theoretically be required to transmit useful information.

That work produced an important lesson.

Making the throat smaller does not automatically make the physics easier.

But it also raised another question:

What exactly are we trying to send through the throat?

A photon?

A different field excitation?

A particle carrying information?

And does that choice change the geometry required for reliable transmission?

That became the next stage of the investigation.

The Carrier and the Channel May Be One Problem

Ordinary communication engineering often allows us to separate the transmission medium from the information being transmitted.

Fiber exists, and we send light through it.

Radio propagation exists, and we modulate electromagnetic waves.

A cable exists, and electrical signals travel through it.

A theoretical wormhole may be different.

The geometry itself can affect how different fields propagate.

That means we cannot simply design a theoretical wormhole and assume that whatever information carrier we choose will pass through it equally well.

Instead, the problem becomes:

Which information carrier works best with the smallest physically meaningful geometry?

This led to the carrier-geometry matching stage of Project WC.

Start With Direct Communication

The project has considered the possibility that a tiny physical object could someday carry stored information through a traversable geometry.

That remains a fallback concept.

But it is not the preferred approach.

If a field excitation can carry information directly through the geometry, then transporting a physical message container adds unnecessary complexity.

So the first comparison focused on direct information carriers.

Among the initial candidates were:

• electromagnetic fields,
• massless Dirac (fermionic) field excitations,
• and scalar-field modes.

These should not be interpreted as three technologies waiting to be built.

They are theoretical probes.

By asking how each behaves in the same test geometry, we can determine whether the choice of carrier significantly changes the transmission requirements.

A Transmission Threshold

For WC-MGT-1, the important quantity is not simply whether some portion of a signal can cross the theoretical geometry.

Communication requires reliable recovery of information.

So we introduced a stronger test.

Instead of asking:

Can anything get through?

we asked:

What conditions are required for approximately 99 percent transmission in the model?

A later research-integrity review found that the original carrier-transmission calculations had preserved the analytical equations and reported numerical results, but not the source code or complete reproducibility record. The calculations were therefore repeated from scratch using the documented WC-MGT-1 geometry, with the governing electromagnetic, scalar, and massless Dirac equations independently rechecked before numerical work began.

Two separately implemented numerical methods were used for the fresh calculation: fixed-step Runge-Kutta shooting and a piecewise-constant transfer-matrix calculation. Numerical domain size, step size, conserved-flux normalization, flux conservation, and threshold finding were tested explicitly. The fresh calculation confirmed the previously reported 99-percent transmission thresholds at their original quoted precision. Complete source code, solver parameters, convergence results, runtime metadata, and numerical outputs from the recalculation were preserved for future independent reproduction.

\[ x=\frac{\omega r_0}{c}, \]

where:

• \(\omega\) is the angular frequency of the excitation,
• \(r_0\) is the throat radius,
• and \(c\) is the speed of light.

This allows different throat sizes and frequencies to be compared using the same scale.

In these calculations, transmission \(T\) is defined as the fraction of the incident conserved field flux transmitted to the opposite asymptotic region. For the electromagnetic and scalar cases this follows from the conserved radial wave flux, while for the massless Dirac case it follows from the conserved radial Dirac current after separation. Because the incident and transmitted asymptotic regions have the same wavenumber in WC-MGT-1, the resulting transmission coefficients can be compared as fractions of each field's incident conserved flux. This comparison does not imply that the different fields carry the same absolute energy per excitation or would be equally practical as communication carriers.

For the lowest modeled radiative electromagnetic mode, \(\ell=1\), the numerical analysis produced approximately

\[ x_{99}^{EM}\approx2.028. \]

Equivalently, the approximate frequency required for 99 percent transmission scales as

\[ f_{99}^{EM}\approx0.323\frac{c}{r_0}. \]

That relationship immediately tells us something important.

As the throat becomes smaller, the frequency required for high transmission increases.

Once again, making the geometry microscopic does not simply make everything easier.

Does Another Carrier Do Better?

The next step was to perform comparable calculations for other field types while keeping the underlying test geometry fixed.

The results were interesting.

For the lowest modeled massless Dirac (fermionic) channel, \(\kappa=1\), the corresponding threshold was approximately

\[ x_{99}^{F}\approx1.734. \]

For the lowest modeled massless scalar mode, \(\ell=0\), the corresponding threshold was approximately

\[ x_{99}^{S}\approx1.735. \]

The electromagnetic value remained

\[ x_{99}^{EM}\approx2.028. \]

So within this particular model and numerical treatment, the fermionic and scalar cases reached the selected transmission threshold at a somewhat lower dimensionless frequency than the electromagnetic case. The fresh documented recalculation confirmed this ordering.

That is a model result.

But it is not evidence that fermions or scalar fields provide a practical wormhole communication system.

And it does not mean that we have discovered the optimal information carrier.

Figure 8A. WC-MGT-1 carrier–geometry matching result. The figure compares modeled candidate information carriers within the selected WC-MGT-1 theoretical geometry. Numerical relationships shown are model results; the depicted wormhole geometry is a conceptual visualization, not a physical simulation or demonstrated wormhole.
Figure created for Beyond the Light Barrier with OpenAI ChatGPT from the WC-MGT-1 model analysis.

Figure 8B. WC-MGT-1 carrier transmission-threshold comparison. A fresh documented recalculation using two separately implemented numerical methods confirmed the previously reported approximate dimensionless thresholds for 99-percent transmission: 1.734 for the fermionic case, 1.735 for the scalar case, and 2.028 for the electromagnetic case. These remain Beyond the Light Barrier numerical model results for a hypothetical fixed wormhole geometry; external independent reproduction has not yet occurred.
Figure created for Beyond the Light Barrier with OpenAI ChatGPT from the WC-MGT-1 numerical analysis.

Lowest Number Does Not Mean Best System

If we optimized only for the lowest calculated transmission threshold, the electromagnetic carrier would not win this particular comparison.

But communication systems have more requirements than transmission through an idealized geometry.

We also have to consider:

• generation,
• modulation,
• detection,
• information fidelity,
• synchronization,
• energy requirements,
• noise,
• and eventual experimental accessibility.

Electromagnetic communication has enormous practical advantages in those areas because we already know how to generate, modulate, transmit and detect electromagnetic signals with extraordinary precision.

That matters.

A modest theoretical advantage in one parameter does not automatically outweigh enormous practical disadvantages elsewhere.

For now, electromagnetic excitation therefore remains the project's primary practical carrier candidate. The modeled massless Dirac case remains an important theoretical comparison, while the scalar case provides a useful theoretical diagnostic. Neither the massless Dirac nor scalar calculation should presently be interpreted as identifying a practical alternative communication technology.

That conclusion can change if future analysis changes the evidence.

Another Negative Result Was Useful

The electromagnetic analysis also looked for something we would have been very happy to find:

a useful low-frequency resonance.

If the geometry naturally provided a transmission resonance at much lower frequencies, that could potentially reduce some of the carrier requirements.

We did not find one in the analyzed WC-MGT-1 electromagnetic potential. This conclusion was subsequently retested during the documented recalculation using a 291-point numerical scan over \(0.05\le x\le1.50\). Transmission was strictly monotonic across the sampled range, with no local transmission maxima detected. This provides strong numerical evidence against a useful low-frequency electromagnetic resonance in the investigated range for WC-MGT-1, but it is not a mathematical proof excluding arbitrarily narrow features between the sampled points.

That is a negative result.

And it belongs in the research record.

The purpose of the calculation was not to produce a favorable answer.

It was to determine what the model actually predicts.

What We Have Learned

The carrier-geometry work has now given us several conclusions within WC-MGT-1.

First, the information carrier cannot simply be chosen after the geometry is designed.

Carrier and geometry have to be evaluated together.

Second, within the WC-MGT-1 numerical treatment, the different modeled field types produced different transmission characteristics in the same theoretical geometry.

Third, the carrier with the mathematically lowest transmission threshold is not necessarily the best engineering choice.

And fourth, microscopic geometry continues to create tradeoffs rather than providing an automatic path toward easier physics.

But there is a much larger problem still waiting for us.

The Geometry Still Has to Exist

Everything described here assumes that WC-MGT-1 exists as a spacetime geometry.

We have not shown that it can exist physically.

We have not shown that it can be manufactured.

We have not demonstrated the required stress-energy distribution.

And we have not demonstrated a wormhole of any size capable of transmitting information.

The carrier analysis therefore answers a deliberately narrow question:

If this theoretical geometry existed, how would different candidate information carriers behave within it?

That distinction is essential.

Where the Research Goes Next

The next stage needs to confront some of the physics that may prevent the geometry from existing in the first place.

In particular, we need to examine more carefully the constraints associated with extreme fields, negative-energy requirements, quantum-field theory, and the limits those constraints may impose on microscopic traversable geometries.

It is entirely possible that those constraints will overwhelm the differences we just found between carriers.

If they do, that is the result we need to document.

The Wormhole Communication project is therefore becoming progressively narrower.

We began with:

Can wormholes provide faster communication?

Then:

What is the smallest useful communication geometry?

Then:

What information carrier best matches that geometry?

And now:

Does known physics permit the required geometry to exist at all?

Each question removes another assumption.

And that is exactly what this research process is supposed to do.

Research Integrity Status

Established evidence: Electromagnetic fields and matter fields exhibit physically measurable propagation behavior.

Accepted theory: Field propagation can depend upon background spacetime geometry. Quantum field theory also places theoretically derived constraints on certain negative-energy and stress-energy configurations under specified assumptions.

Published speculative theory: Traversable-wormhole geometries and field propagation through those theoretical geometries.

Beyond the Light Barrier reproduced computational result: Within the selected WC-MGT-1 test geometry, a fresh documented recalculation confirmed the previously reported approximate 99-percent transmission thresholds of \(x_{99}^{EM}\approx2.028\), \(x_{99}^{F}\approx1.734\), and \(x_{99}^{S}\approx1.735\). The governing equations were rechecked before numerical work began, and two separately implemented numerical methods were used with convergence, conserved-flux, and threshold-finding checks. Source code, solver parameters, convergence data, runtime metadata, and numerical outputs from the recalculation were preserved. This constitutes reproduction within the Beyond the Light Barrier project; external independent reproduction by another researcher or independently controlled group has not yet occurred.

Beyond the Light Barrier negative computational result: A fresh numerical scan of the WC-MGT-1 electromagnetic transmission behavior over \(0.05\le x\le1.50\) found strictly monotonic transmission and no local transmission maxima among the 291 sampled points. This confirms the project's earlier negative result that no useful low-frequency electromagnetic resonance was found in the investigated range. The finite numerical scan does not constitute a mathematical proof that arbitrarily narrow unsampled features cannot exist.

Beyond the Light Barrier engineering assessment: Among the carrier cases examined so far, electromagnetic excitation remains the project's primary practical carrier candidate despite its somewhat higher modeled transmission threshold because established electromagnetic technology provides substantial advantages in generation, modulation, detection, measurement, and experimental accessibility. This is an engineering assessment within the current project scope, not a demonstration that electromagnetic excitation can propagate through a physically realizable wormhole.

Not demonstrated: A physical traversable wormhole, manufactured negative-energy configuration, wormhole communication channel, or faster-than-light information transfer.

Sources & Further Reading

• Michael S. Morris and Kip S. Thorne (1988), “Wormholes in Spacetime and Their Use for Interstellar Travel: A Tool for Teaching General Relativity.” American Journal of Physics, 56, 395–412. This foundational paper develops the static, spherically symmetric traversable-wormhole framework used as the theoretical starting point for WC-MGT-1. The existence of the mathematical solutions does not demonstrate that such wormholes can be physically constructed.

  Morris–Thorne traversable-wormhole paper

• S. E. Perez Bergliaffa and K. E. Hibberd (2000), “Electromagnetic Waves in a Wormhole Geometry.” Physical Review D, 62, 044045. This paper studies electromagnetic-wave propagation through a static wormhole, reduces the propagation problem to a one-dimensional Schrödinger-like scattering equation with a barrier potential, and numerically evaluates the transmission coefficient. It provides direct published background for treating electromagnetic propagation through a theoretical wormhole geometry. It does not validate the specific WC-MGT-1 numerical thresholds reported in this entry.

  Electromagnetic waves in a wormhole geometry

• P. Pitelli and P. S. Letelier-related wormhole fermion-scattering literature; see “Scattering of charged fermion to two-dimensional wormhole with constant axial magnetic flux” (2020). European Physical Journal C, 80, 1111. This work studies the Dirac equation and fermionic scattering in a curved wormhole geometry, including incident, reflected, and transmitted fermionic waves. It provides published background showing how fermionic fields can be formulated as a wormhole scattering problem. The geometry and physical assumptions differ from WC-MGT-1, so this reference does not validate the specific fermionic effective potential or numerical transmission threshold reported in this entry.

  Scattering of charged fermion to two-dimensional wormhole with constant axial magnetic flux

• Sayan Kar, Deshdeep Sahdev, and Biplab Bhawal (1994), “Scalar Waves in a Wormhole Geometry.” Published work on wave propagation in theoretical wormhole spacetimes provides background for the idea that a field’s transmission behavior depends on the geometry through which it propagates. Such studies motivate treating the information carrier and the spacetime geometry as a coupled problem rather than assuming every field propagates identically.

  Scalar-field propagation in wormhole geometry

• P. Dutta Roy, S. Aneesh, and Sayan Kar (2020), “Revisiting a Family of Wormholes: Geometry, Matter, Scalar Quasinormal Modes and Echoes.” This work examines how scalar perturbations behave in a family of ultrastatic wormhole geometries and shows that changes in wormhole geometry alter the effective wave-propagation potential and observable mode structure. It provides further background for the carrier–geometry relationship explored in Project WC.

  Wormhole geometry and field propagation

• L. H. Ford and Thomas A. Roman (1996), “Quantum Field Theory Constrains Traversable Wormhole Geometries.” Physical Review D, 53, 5496. Ford and Roman applied quantum-inequality bounds to the negative-energy distributions associated with traversable wormholes, finding severe restrictions on familiar semiclassical wormhole configurations. These constraints are directly relevant to the next stage of WC-MGT research.

  Ford & Roman — Quantum constraints on traversable wormholes

• C. J. Fewster and S. P. Eveson (1998), “Bounds on Negative Energy Densities in Flat Spacetime.” Physical Review D, 58, 084010. This work develops more general quantum-inequality bounds on time-averaged negative energy densities in quantum field theory. Such results help define the limits that any proposed negative-energy-supported spacetime geometry must confront.

  Fewster & Eveson — Quantum inequalities and negative energy

Note on the numerical results: A later research-integrity review found that the original WC-MGT-1 carrier-transmission calculations had preserved the analytical equations and reported numerical results, but not the source code or complete reproducibility record. The calculations were therefore repeated from scratch in a fresh documented recalculation. The governing electromagnetic, scalar, and massless Dirac equations were rechecked, and two separately implemented numerical methods were used: fixed-step Runge-Kutta shooting and a piecewise-constant transfer-matrix calculation. Numerical domain size, step size, conserved-flux behavior, threshold finding, and convergence were tested explicitly. The fresh calculation confirmed the previously reported 99-percent transmission thresholds at their original quoted precision. Source code, solver parameters, convergence results, runtime metadata, and numerical outputs from the recalculation were preserved. These results have therefore been reproduced computationally within the Beyond the Light Barrier project, but they have not yet been independently reproduced by an external researcher or independently controlled group.

Research Journal Entry 7

From Wormhole Theory to a Communication Geometry

The Wormhole Communication project has reached an important transition.

Until now, much of the public Research Journal has focused on defining the problem and establishing how the research should proceed.

Can communication be investigated independently from propulsion?

Can an enormous interstellar problem be reduced to a laboratory-scale question?

What would constitute evidence?

What would falsify a model?

And how do we prevent an interesting mathematical result from being mistaken for a physical discovery?

The latest Wormhole Communication work has begun moving from those broad questions toward a specific geometry that can be analyzed mathematically.

That model is designated:

WC-MGT-1 — Minimum Geometry Throat, Model 1.

Here, Minimum Geometry Throat describes the project's research objective: investigating how small and physically constrained a communication-oriented geometry might be made while retaining a defined transmission capability. The name does not imply that WC-MGT-1 has been mathematically proven to be the smallest possible wormhole geometry, a global optimum among traversable-wormhole solutions, or a physically realizable minimum.

The question behind it is deliberately narrow:

What is the smallest useful spacetime geometry that could theoretically permit the transmission of information?

Communication Changes the Design Target

Most familiar discussions of traversable wormholes imagine transporting something substantial through them.

A spacecraft.

A person.

Perhaps matter of some other kind.

Project Communication begins with a much smaller requirement.

The first useful system would not need to transport a spacecraft.

It would not need to transport a person.

The initial target is simply:

Determine whether a theoretical spacetime geometry could permit at least one recoverable piece of information to pass between two endpoints by a path distinct from conventional propagation through ordinary space.

That distinction matters.

A throat large enough for a spacecraft and a geometry sufficient to transmit an information-bearing physical excitation represent very different research targets.

So instead of asking how large a wormhole can be made, WC-MGT-1 begins by asking how little geometry might actually be required.

Starting With an Existing Theoretical Framework

WC-MGT-1 does not begin by inventing a new theory of gravity.

It starts with general relativity and uses the Morris-Thorne class of traversable-wormhole geometries as a theoretical test case.

A commonly used form of the static, spherically symmetric metric is:

\[ ds^2 = -e^{2\Phi(r)}c^2dt^2+ \frac{dr^2}{1-b(r)/r} +r^2d\Omega^2. \]

For this first model, the redshift function is simplified to

\[ \Phi(r)=0, \]

and the following shape function is selected:

\[ b(r)=\frac{r_0^2}{r}, \]

where \(r_0\) represents the throat radius. Together with \(\Phi(r)=0\), this corresponds to the familiar ultrastatic Ellis-type wormhole geometry when expressed in Morris-Thorne coordinates. The geometry itself is therefore not new to Beyond the Light Barrier; WC-MGT-1 is the project's use of this established theoretical geometry as a communication-oriented test model.

There is an important research-integrity distinction here.

We are not claiming that this geometry describes a device that can be constructed.

It is a theoretical test geometry.

Its usefulness is that it gives us something explicit enough to analyze.

Working Backward Through Einstein's Equations

Einstein's field equations connect spacetime geometry with matter and energy:

\[ G_{\mu\nu} = \frac{8\pi G}{c^4}T_{\mu\nu}. \]

Usually we think about this relationship in one direction:

Given matter and energy, how is spacetime curved?

WC-MGT-1 asks what might be called an inverse-design question:

If we specify a geometry with properties we want, what stress-energy would Einstein's equations require for that geometry?

This calculation runs from an assumed geometry to its required stress-energy tensor. It does not provide a method for creating that stress-energy, demonstrate that suitable matter or quantum fields exist, or establish that the assumed geometry is physically realizable.

For the selected shape function,

\[ b'(r)=-\frac{r_0^2}{r^2}. \]

Under the standard Morris-Thorne orthonormal-frame formulation, the local energy density can be expressed as

\[ \varepsilon(r)= \frac{c^4}{8\pi G} \frac{b'(r)}{r^2} = -\frac{c^4}{8\pi G} \frac{r_0^2}{r^4}, \]

where \(\varepsilon\) denotes energy per unit proper volume. This is equivalent to writing \(T_{\hat t\hat t}=\rho c^2\) when \(\rho\) is expressed as mass-equivalent density.

At the throat, \(r=r_0\), the local energy density becomes

\[ \varepsilon_0= -\frac{c^4}{8\pi G r_0^2}. \]

The negative sign is important.

For this particular geometry, the magnitude of the throat energy density therefore scales as

\[ |\varepsilon_0|\propto\frac{1}{r_0^2}. \]

This gives us an important lesson from WC-MGT-1:

Smaller does not automatically mean physically easier.

The Microscopic-Wormhole Trap

It is tempting to reason that if a human-sized wormhole is extraordinarily difficult, we should simply make the wormhole microscopic.

Within the selected WC-MGT-1 geometry, the analysis illustrates why throat size cannot be treated as the only consideration in the search for a less demanding communication configuration.

As \(r_0\) decreases in this selected geometry, the magnitude of the required local energy density increases as \(1/r_0^2\).

A microscopic geometry can therefore exchange one problem for another.

Instead of requiring an enormous region with unusual properties, it may require increasingly extreme local conditions concentrated into a much smaller region.

This does not establish that every possible microscopic wormhole geometry behaves this way.

It tells us what happens for this selected test geometry.

That distinction is important.

The Null-Energy-Condition Problem

WC-MGT-1 also encounters one of the central difficulties of classical traversable-wormhole physics.

The WC-MGT-1 geometry also requires violation of the null energy condition (NEC) at and near the throat. In the Morris-Thorne framework, the relevant condition for a radial null direction involves the combination of energy density and radial pressure, rather than negative energy density alone. For the selected WC-MGT-1 shape and redshift functions, that combination violates the NEC at the throat. This is consistent with the exotic stress-energy requirement of classical Morris-Thorne traversable-wormhole geometries.

Quantum field theory complicates the picture because classical pointwise energy conditions are not universally obeyed by quantum fields. But negative-energy configurations are not unrestricted. Under specified assumptions, quantum energy inequalities place bounds on suitably averaged negative energy densities, with the allowed magnitude related to the duration or sampling scale. Such inequalities have been applied to traversable-wormhole geometries and can impose severe restrictions on particular semiclassical wormhole configurations. They do not by themselves establish that every conceivable wormhole geometry is impossible.

The Casimir effect is an experimentally established quantum-field phenomenon associated with altered field modes under particular boundary conditions. Casimir experiments do not demonstrate that the magnitude, distribution, duration, or controllability of negative stress-energy required by WC-MGT-1 can be produced. The Casimir effect therefore should not be interpreted as evidence that the stress-energy needed to construct or sustain this traversable-wormhole geometry is experimentally available.

That remains an enormous unresolved physical obstacle.

More Than One Variable Matters

WC-MGT-1 is therefore pushing the project away from a single-variable question.

We should not merely ask:

How small can the throat be?

The emerging research space includes quantities such as

\[ (r_0,\;L_W,\;\delta,\;\tau,\;\text{carrier}). \]

Here:

• \(r_0\) is the throat-radius parameter of the selected WC-MGT-1 geometry;
• \(L_W\) is a Beyond the Light Barrier proposed research variable representing a proper internal path relevant to transmission;
• \(\delta\) is a Beyond the Light Barrier proposed research variable for characterizing the spatial extent of the unusual stress-energy region;
• \(\tau\) is a Beyond the Light Barrier proposed research variable representing the duration for which traversability would be required;
• and carrier identifies the physical field or excitation considered for encoding and transmitting information.

There is an important distinction between these variables.

They have not all been derived as independent optimization parameters of WC-MGT-1.

Some describe the chosen geometry. Others are Beyond the Light Barrier research variables that future iterations will investigate.

The developing question is therefore broader than simply minimizing \(r_0\):

Can a complete communication configuration be identified whose physical requirements are less severe?

Does It Need to Remain Open?

This raises another hypothesis for future investigation.

If a hypothetical communication geometry only needed to transmit a small amount of information, perhaps continuous traversability would not be necessary.

A future model could investigate whether a transient geometry would require an active interval satisfying a condition conceptually resembling

\[ \tau_{\text{active}}>T_{\text{traversal}}, \]

where \(\tau_{\text{active}}\) represents the proposed duration of traversability and \(T_{\text{traversal}}\) represents the relevant signal-transit time defined by that future model.

This inequality is not a result of WC-MGT-1 and is not presently a derived condition for a physical wormhole. It is a Beyond the Light Barrier hypothesis intended to frame a future question: whether reducing the required duration of traversability could alter any of the physical constraints. A future dynamical model would still have to address whether such a transient geometry could form, remain traversable and stable long enough for transmission, and satisfy the applicable gravitational and quantum-field constraints.

There is currently no experimental evidence that a manufactured transient traversable wormhole can be created.

The purpose of introducing \(\tau\) is to determine mathematically whether reducing required active duration changes any of the relevant physical constraints.

What Should Carry the Information?

We should also avoid choosing the information carrier prematurely.

Electromagnetic radiation is the obvious choice for ordinary communication, but a hypothetical wormhole geometry would require analysis of how particular fields or excitations propagate through that spacetime.

The appropriate research question is therefore:

Which physically permissible information carrier, if any, produces the least demanding combination of geometry and reliable information transfer?

Photons may prove appropriate.

Another field excitation may provide a useful theoretical comparison.

Or the analysis may show that changing the carrier does nothing to resolve the fundamental stress-energy problem.

That comparison is one of the next research tasks.

Later research note: This carrier comparison was subsequently carried out within WC-MGT-1 using the lowest modeled electromagnetic, massless scalar, and massless Dirac channels. The calculations found different transmission thresholds for the three modeled field cases, but did not remove the underlying requirement for the assumed wormhole geometry and its associated stress-energy. Electromagnetic excitation remained the project's primary practical carrier candidate because of its established generation, modulation, detection, and measurement capabilities. These later results are numerical model results for a hypothetical fixed geometry, not evidence that a physical wormhole communication channel exists.

What WC-MGT-1 Does Not Show

WC-MGT-1 does not demonstrate that:

• physical traversable wormholes exist;
• a wormhole can be manufactured;
• the required negative stress-energy can be engineered;
• two usable endpoints can be created and separated;
• endpoint identity can be preserved;
• information can actually be transmitted through a manufactured wormhole;
• such information would arrive faster than a conventional light signal through ordinary space;
• the Casimir effect supplies the physical resources necessary to construct such a geometry.

Those remain unresolved questions.

WC-MGT-1 is a mathematical test model, not an experiment. Its metric and associated stress-energy requirements can be analyzed using general relativity, and fields can be modeled propagating through the assumed geometry, but those calculations do not establish that the geometry can exist in nature or be engineered. Any future experimental claim would require physical observations that cannot be explained by conventional propagation or other known effects.

What We Have Learned

The result is intentionally modest.

But the research question has become considerably more precise.

We began with:

Can wormholes be used for communication?

We are now asking:

What combination of geometry, spatial extent, active duration, internal path, and information carrier minimizes the physical requirements for transferring one recoverable piece of information?

That is a better research question.

It provides variables we can analyze.

It gives us assumptions we can challenge.

It exposes physical constraints.

And, importantly, it gives future models opportunities to fail.

The Next Step

The next WC work will investigate carrier-geometry matching.

Rather than choosing a communication carrier because it is familiar, we will compare candidate information-bearing excitations against the requirements imposed by the geometry.

The objective will be to determine whether carrier choice materially changes the Minimum Geometry Throat problem—or whether the underlying geometric and stress-energy requirements dominate regardless of carrier.

Either result would move the research forward.

WC-MGT-1 does not give us a communication device.

It gives us something more appropriate for this stage of the project:

a smaller and more precise problem to try to break.

Research Integrity Status

Established evidence: General relativity has passed extensive observational and experimental tests in the regimes where it has been tested. Quantum-field phenomena, including the Casimir effect, are experimentally measurable. These established results do not constitute evidence that traversable wormholes exist.

Accepted theory: Einstein's field equations relate spacetime geometry to stress-energy. Within general relativity, specifying a spacetime metric allows the stress-energy tensor required by that geometry to be calculated. Classical traversable-wormhole geometries of the Morris-Thorne type require violation of the null energy condition near the throat.

Published speculative theory: Traversable wormholes are mathematically studied solutions and models within gravitational physics, but no physical traversable wormhole has been observed. Quantum energy inequalities place significant restrictions on particular negative-energy configurations proposed for supporting traversable wormholes.

Beyond the Light Barrier model: WC-MGT-1 adopts the published ultrastatic Ellis-type wormhole geometry, expressed in Morris-Thorne coordinates with \(\Phi(r)=0\) and \(b(r)=r_0^2/r\), and uses it as a communication-oriented mathematical test model. Beyond the Light Barrier does not claim to originate this spacetime geometry. The project-specific contribution at this stage is the WC-MGT-1 research framing: using the geometry to investigate minimum communication requirements, proposed optimization variables, carrier selection, and related constraints. The resulting stress-energy requirements and throat-energy-density scaling follow from the selected geometry and are not universal properties of every proposed wormhole.

Beyond the Light Barrier hypotheses and research variables: The proposed internal path \(L_W\), stress-energy-region scale \(\delta\), active duration \(\tau\), carrier selection, and transient-traversability question are elements of the project's developing research framework. They have not all been derived as independent physical degrees of freedom of WC-MGT-1, and the proposed timing relation \(\tau_{\mathrm{active}}>T_{\mathrm{traversal}}\) is not presently a derived condition for a physical wormhole.

Not demonstrated: The physical existence, creation, stabilization, or engineering of a traversable wormhole; production of the required negative stress-energy configuration; creation and separation of usable endpoints; transmission of information through a manufactured wormhole; or faster-than-light information transfer.

Sources & Further Reading

Morris, Michael S., and Kip S. Thorne (1988), “Wormholes in spacetime and their use for interstellar travel: A tool for teaching general relativity.” American Journal of Physics, 56, 395–412. This paper develops the static, spherically symmetric traversable-wormhole framework used to express and analyze WC-MGT-1, including the redshift function, shape function, throat conditions, and relationship between geometry and stress-energy. WC-MGT-1 adopts the particular choices \(\Phi(r)=0\) and \(b(r)=r_0^2/r\), which correspond to the previously published ultrastatic Ellis-type geometry described in the following reference. Beyond the Light Barrier selects this geometry as a communication-oriented test model; it does not claim to originate the underlying spacetime geometry or imply that it has been physically realized.
Read the paper

Ellis, Homer G. (1973), “Ether flow through a drainhole: A particle model in general relativity.” Journal of Mathematical Physics, 14, 104–118. Ellis develops an early static, spherically symmetric, horizonless two-ended geometry supported by a scalar field with a reversed-sign coupling. The massless form of this solution is closely associated with the geometry later commonly called the Ellis or Ellis–Bronnikov wormhole. When expressed in Morris–Thorne coordinates, the ultrastatic form used by WC-MGT-1 corresponds to \(\Phi(r)=0\) and \(b(r)=r_0^2/r\). WC-MGT-1 therefore does not originate this spacetime geometry; Beyond the Light Barrier selects it as a theoretical test geometry for investigating communication-oriented questions.

Read the Ellis paper

Ford, L. H., and Thomas A. Roman (1996), “Quantum field theory constrains traversable wormhole geometries.” Physical Review D, 53, 5496–5507. Ford and Roman apply quantum-inequality restrictions to negative energy in static traversable-wormhole geometries and find severe constraints on the configurations they analyze. Their work is directly relevant to WC-MGT-1 because it shows that specifying a classical wormhole geometry is not sufficient; the required stress-energy must also be compatible with applicable quantum-field constraints. These results place strong restrictions on particular semiclassical traversable-wormhole configurations but should not be interpreted as a general mathematical proof that every conceivable wormhole geometry is impossible.
Read the paper · Free preprint

Fewster, Christopher J. (2012), “Lectures on quantum energy inequalities.” Lecture notes, arXiv:1208.5399. These lectures review quantum energy inequalities and explain how quantum fields can violate classical pointwise energy conditions while still being subject, under specified assumptions, to bounds on suitably averaged negative energy densities. This provides theoretical background for the negative-energy constraints discussed in this entry. The lectures do not analyze WC-MGT-1 specifically and should not be interpreted as establishing a universal prohibition on traversable wormholes.
Read the lecture notes

Lamoreaux, S. K. (1997), “Demonstration of the Casimir Force in the 0.6 to 6 μm Range.” Physical Review Letters, 78, 5–8. This experiment reports a measurement of the Casimir force, providing experimental evidence for a quantum-field effect produced by altered field modes under imposed boundary conditions. Its inclusion here does not imply that the experiment produced, measured, or demonstrated the controllable negative stress-energy configuration required by WC-MGT-1. In particular, it does not demonstrate that the magnitude, spatial distribution, duration, or geometry required to support a traversable wormhole can be engineered.
Read the paper

Relationship to the Beyond the Light Barrier research project

These references provide the theoretical framework and experimental background discussed in this entry. WC-MGT-1 is the project’s designation for its selected mathematical test model. The communication-focused research questions—including carrier selection, proposed active duration, and comparison of complete communication configurations—remain subjects for further investigation.

The energy-density scaling illustrated in Figure 7 follows from the specific geometry and equations presented in this entry. It should not be interpreted as a universal result for every wormhole geometry or as evidence that a working communication device has been demonstrated.

Research Journal Entry 5

 

Looking Beyond the Warp Bubble

The name Project Warp Drive creates an immediate mental picture.

In the Alcubierre proposal, a spacecraft is associated with a localized region of spacetime often described as a warp bubble. The metric is constructed so that space contracts in the direction of travel and expands behind the region. The spacecraft need not locally move through its immediate spacetime faster than light; instead, the proposed geometry can produce an effective displacement between distant locations that appears superluminal to distant observers.

That idea is closely associated with the Alcubierre metric and has become one of the best-known scientific approaches to the faster-than-light travel question.

It is also very easy for the name of the project to become a constraint on the research.

I do not want that to happen.

Warp Drive is the name of the project. It is not a requirement that the eventual answer be a warp drive.

The Question Is Bigger Than a Particular Solution

The actual research question is broader:

Does established physics—or a clearly identified and scientifically testable extension of it—permit any mechanism by which an object could traverse a distance in less time than light would require to cross the corresponding distance through ordinary space, without requiring the object itself to move locally through spacetime faster than light?

This question does not assume that such a mechanism exists. Proposed mechanisms must be classified according to their evidentiary status: established theory, published speculative theory, Beyond the Light Barrier hypothesis, or engineering concept. Any proposed extension beyond established physics must introduce testable consequences and cannot be treated as established merely because it would make faster-than-light transportation possible.

An Alcubierre-style spacetime geometry is one possible area of investigation.

It is not the only one we should consider.

If another mechanism provides a better path, Project Warp Drive should follow the evidence rather than remain committed to its name.

This distinction matters because research can become trapped by its starting assumptions.

If we begin with:

How do we build an Alcubierre drive?

we have already assumed that an Alcubierre drive is the solution.

A better question is:

What physical mechanisms, if any, could produce effective superluminal transportation?

That question permits the answer to be:

None that physics allows.

It also permits an answer we did not anticipate.

What Established Physics Says

Special relativity places a very strong constraint on this investigation.

An ordinary massive object cannot simply accelerate through local spacetime from below the speed of light to above it using conventional propulsion.

As its velocity approaches the speed of light, the required energy increases dramatically. Within special relativity, accelerating a massive object through the light-speed boundary is not an available engineering solution.

That means Project Warp Drive should not begin by asking how to build a sufficiently powerful rocket.

The problem is more fundamental than propulsion power.

General relativity changes the nature of the question because spacetime itself is dynamical.

Matter and energy influence spacetime geometry, and spacetime geometry influences the motion of matter.

This permits mathematical investigation of spacetime geometries whose global behavior differs substantially from an ordinary spacecraft locally accelerating through space. Warp metrics and traversable-wormhole geometries are examples studied within that theoretical landscape.

However, the existence of a mathematically defined spacetime geometry does not establish that the required stress-energy can exist in the necessary form, that the geometry can arise from physically realistic initial conditions, that it can remain stable, or that it can be created and controlled by an engineered system.

Mathematical consistency or analyzability is therefore not the same thing as physical feasibility.

A Metric Is Not an Engine

This distinction is particularly important when discussing warp-drive research.

A spacetime metric can describe a geometry with interesting properties.

That does not tell us that nature provides the matter, energy, boundary conditions, stability, or control mechanisms necessary to construct that geometry.

It certainly does not provide an engine design.

Therefore, when Beyond the Light Barrier examines a warp metric, it should distinguish at least three different questions:

Can the geometry be expressed mathematically?

Can the required stress-energy exist physically?

Could an engineered system create and control it?

A positive answer to the first question does not imply positive answers to the other two.

Do Not Start With a Starship

There is another assumption worth challenging.

Even if some new propulsion or spacetime effect exists, why assume that the first demonstration must move a spacecraft?

Perhaps the first meaningful result would involve something extremely small.

A particle.

A field.

A microscopic displacement.

A measurable change in propagation.

A tiny alteration of spacetime geometry.

Or something we have not yet considered.

The engineering problem of transporting people across interstellar distances is enormous.

The scientific question of whether a particular physical effect exists may be much smaller.

This leads Project Warp Drive toward the same basic research philosophy that is developing within Project Communication:

Start with the smallest credible test capable of answering the next physical question.

Where a controlled physical experiment is possible, the project should begin at the smallest useful experimental scale rather than with a vehicle-scale demonstration. Where direct experimentation is not yet possible, the next test may instead be an analytical calculation, numerical simulation, comparison with existing observations, or examination of a necessary physical consequence. Such theoretical or computational tests can constrain or reject a proposal, but they should not be described as experimental demonstrations of the underlying phenomenon.

Scale Comes Later

Suppose, hypothetically, that a small experiment eventually detected an unusual and repeatable physical effect potentially relevant to propulsion.

That would not mean we had invented a starship.

The next questions would concern scaling.

How does the effect change with mass?

How does it change with distance?

How much energy does it require?

Does the required energy grow linearly, quadratically, exponentially, or according to some other relationship?

Can the effect be sustained?

Can it be controlled?

Does the system remain stable?

What happens to matter exposed to it?

What happens when the effect begins and ends?

Those questions determine whether a physical curiosity can ever become useful engineering.

An effect that works for a microscopic system but requires impossible energy to scale to a kilogram may still be scientifically interesting while being useless for transportation.

We need to be willing to reach that conclusion.

The Occupants Matter Too

A transportation system is not useful for human travel merely because an object can reach a destination.

The object—and eventually living occupants—must survive the trip.

That introduces another research path within Project Warp Drive.

Any serious propulsion concept eventually needs to consider acceleration, tidal forces, radiation, field gradients, thermal effects, interactions with matter and dust, transitions into and out of the proposed state, and other environmental consequences.

For a speculative spacetime propulsion mechanism, there may also be hazards that cannot yet be predicted because the mechanism itself has not been demonstrated.

Biological survivability therefore cannot be treated as an afterthought.

But, just as with propulsion, the investigation should proceed in stages.

We do not begin with a human passenger.

We begin by determining what the proposed physical environment would do to matter.

Communication Remains Connected

Project Communication and Project Warp Drive are separate research paths, but they are not completely independent.

A future propulsion system would need instrumentation.

If an experimental device ever produced a measurable effect associated with an unusual spacetime geometry or other candidate propulsion mechanism, we would want sensors positioned wherever the particular model predicts useful measurements. For a model involving a bounded or spatially localized region, that could include measurements outside, near the boundary of, and—where physically meaningful and practical—within the affected region.

That immediately raises communication questions.

Can information cross the boundary?

What would an outside observer measure?

What would an internal instrument measure?

Could the two records be synchronized and compared afterward?

If real-time communication were impossible, could an internal recorder survive the experiment and be recovered?

These are engineering questions today, not evidence that such a field or boundary can be produced.

But considering them early may prevent us from designing future experiments that cannot tell us what happened.

Follow the Evidence, Not the Name

This brings Project Warp Drive to an important methodological commitment.

We will continue studying warp-drive physics.

We will continue examining general relativity, spacetime geometry, energy requirements, causality, quantum effects, and proposed warp metrics.

Causality must be treated as a fundamental screening condition for any proposed faster-than-light mechanism. A geometry or propulsion concept should not be considered physically viable merely because its mathematics appears to permit effective superluminal travel. The project must also examine whether the proposal creates horizons, reference-frame-dependent event ordering, closed timelike curves or related causal-loop possibilities, or control problems that prevent the proposed motion from being initiated or directed as assumed.

But we will also remain willing to investigate other mechanisms if there is legitimate physical or experimental justification for doing so.

And we must remain willing to abandon an attractive idea when the evidence becomes sufficiently strong against it.

A model should not survive simply because we like it.

A mechanism should not receive preferential treatment because it resembles science fiction.

And a project called Warp Drive does not have to produce a warp drive.

What Success Would Actually Mean

There are many possible levels of success.

One level might simply be demonstrating that a proposed mechanism cannot work.

Another might be finding a previously overlooked constraint.

Another could be developing a more efficient way to experimentally test an existing theoretical proposal.

A much more significant result would be identifying a repeatable physical effect potentially relevant to spacetime manipulation or unconventional propulsion that survives appropriate controls, uncertainty analysis, and attempts to explain it through established physics. Confidence would increase further if the result could be independently reproduced or replicated outside the project.

Only far beyond those stages would it become appropriate to discuss an actual vehicle.

That may be a very long road.

It may also be a road that eventually ends.

That is acceptable.

Beyond the Light Barrier is not attempting to guarantee a destination.

The purpose of the research is to find out where the road actually goes.

For Project Warp Drive, that means keeping the destination in sight while refusing to decide in advance what kind of engine must take us there.

Research Integrity Status

Established physics: Special relativity does not permit an ordinary massive object to be accelerated locally through the speed of light by conventional propulsion. General relativity treats spacetime geometry as dynamical and permits mathematical investigation of geometries whose global behavior can differ substantially from ordinary motion through flat spacetime.

Published speculative theory: Warp-drive metrics, including the Alcubierre geometry, are published theoretical solutions or models studied within general relativity. Their mathematical formulation does not establish that the required stress-energy, initial conditions, stability, causal structure, or control mechanisms are physically realizable.

Beyond the Light Barrier research framework: Project Warp Drive deliberately treats “Warp Drive” as a project name rather than a commitment to the Alcubierre metric or any other predetermined mechanism. The project may investigate warp geometries and other candidate mechanisms, but each must be classified according to its evidentiary status and evaluated against established physical constraints.

Engineering concepts: Ideas discussed here concerning small-scale tests, instrumentation, internal and external measurements, survivability, scaling, communication, and eventual vehicle applications are research and engineering questions. They are not evidence that a usable spacetime-propulsion mechanism currently exists.

Not demonstrated: Beyond the Light Barrier has not demonstrated faster-than-light transportation, a warp field or warp bubble, engineered spacetime manipulation, a physically realizable traversable wormhole for transportation, or any other propulsion mechanism capable of effective superluminal travel.

Sources & Further Reading

• Miguel Alcubierre (1994), “The Warp Drive: Hyper-fast Travel Within General Relativity.” Classical and Quantum Gravity, 11, L73–L77. Alcubierre introduced a spacetime metric in which expansion behind and contraction ahead of a localized region can produce effective superluminal displacement as viewed by distant observers while the transported object remains locally on a timelike trajectory. In the original construction, the stress-energy required to support the geometry includes regions of negative energy density and violates standard energy conditions. The paper establishes a theoretical spacetime solution within general relativity; it does not demonstrate that the required stress-energy can be physically produced or that such a geometry can be engineered.
  Alcubierre — The Warp Drive · Free preprint

• Miguel Alcubierre and Francisco S. N. Lobo (2021), “Warp Drive Basics.” This review surveys the theoretical foundations and major physical difficulties associated with warp-drive spacetimes, including energy-condition violations, horizons, causality, and questions concerning the creation and control of superluminal warp configurations. The severity and form of these problems can depend on the particular geometry being considered, so they should be evaluated for each proposed model rather than assumed to be identical for every warp-drive spacetime. The review provides theoretical context; it does not report an experimental demonstration of a warp drive or engineered spacetime propulsion.
  Alcubierre & Lobo — Warp Drive Basics

• Michael J. Pfenning and L. H. Ford (1997), “The Unphysical Nature of ‘Warp Drive.’” Classical and Quantum Gravity, 14, 1743–1751. Pfenning and Ford analyze the Alcubierre warp-drive spacetime using quantum-inequality constraints and find severe restrictions on the negative-energy distribution for the configurations they examine, including an extremely thin bubble wall under their assumptions and correspondingly demanding energy requirements. Their result is an important warning that a mathematically defined warp geometry may encounter strong quantum-field constraints. It should not, however, be interpreted as a general proof that every conceivable warp-drive geometry or future spacetime-propulsion proposal is physically impossible.
  Pfenning & Ford — Published Paper · Free preprint

• Marc G. Millis (2005), “Assessing Potential Propulsion Breakthroughs.” NASA/TM-2005-213998, NASA Glenn Research Center. This report summarizes lessons from NASA's Breakthrough Propulsion Physics Project, which examined highly speculative goals including propellantless propulsion and faster-than-light travel. Particularly relevant to Beyond the Light Barrier is its emphasis on addressing immediate unknowns and critical issues, placing the reliability of assertions ahead of the implications of a desired result, and preserving null or unresolved outcomes. The report provides historical and methodological context; it does not establish that faster-than-light propulsion is physically achievable.
  NASA — Assessing Potential Propulsion Breakthroughs

• Michael R. LaPointe (2024), “Interstellar Propulsion.” NASA Marshall Space Flight Center; book chapter in Interstellar Travel: Propulsion, Life Support, Communications, and the Long Journey. This overview illustrates the enormous transportation challenge posed by interstellar distances using existing spacecraft performance, including Voyager 1 as a reference point. It provides context for why radically improved propulsion remains scientifically interesting, but it does not provide evidence for faster-than-light propulsion or imply that such propulsion is required to conduct meaningful interstellar or precursor exploration.
  NASA — Interstellar Propulsion