Questions tagged [warp-drives]

warp drives are generic conceptual space travel mechanisms that try to work around physical limits in the speed of propagation of light imposed by special relativity. Usually they resort to speculative science (exotic matter), or phenomena that are not yet well understood or is hard to make validation experiments (non-eternal rotating black holes)

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When can information escape from a black hole through a warp bubble-like spacetime?

It is well known that nothing can escape a black hole, including gravitational radiation. Many questions have been asked here about this topic, such as: Can gravitational waves escape a black hole? ...
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Shift Vector in Warp Equation

In the Alcubierre metric, why is there a beta with subscript multiplied by a beta with superscript? I know beta with subscript is the shift vector, but what is the difference between the two? $$\text ...
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How would a warp bubble interact with an atmosphere? [closed]

What would happen if a warp drive entered the Earth atmosphere? IIRC some scientists have created mathematical models that have shown that warp bubbles that don't exceed the speed of light may be ...
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Escaping from inside the event horizon [duplicate]

This is a hypothetical question. An Alcubierre Warp Drive can theoretically go any speed because space is moving and the ship is not. Could a ship equipped with this drive escape from inside an ...
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What exactly is the motion in Warp drive?

I know that there exists something like the Alcubierre warp bubble, and there are many threads here about it, but unfortunately the answers didn't help me to understand what the basic principle is... ...
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Does this research paper prove that warp drives are impossible?

Does this preprint prove that warp drives are impossible? J. Santiago, S. Schuster and M. Visser, "Generic warp drives violate the null energy condition" It states that the NEC (Null Energy ...
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Energy distorting space

We know that mass distort space and time. Can energy do the same? How much heat will it take to create an observable effect? can we make a warp drive on that principle? By heating one end of a space ...
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Warp drive small scale experiments “proof of concept” [duplicate]

Possible small scale warp drive experiments, or small scale experiments with quantum mechanics to model space-time warping? Why is it so difficult to engineer a small scale warp drive even though ...
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Erik Lentz's faster-than-light soliton

It's well known that, in relativity, if you can go faster than light, you can go backwards in time and create a paradox. Also, attempts to create "warp-drive" space-times in which something ...
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Analogy for Lentz soliton

Analogy for Alcubeirre Warp Drive: Every explanation of warp drive in layman terms has this sentence in it: "The Warp Drive will contract space in thier front and expand space behind." (I ...
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Testing space-time warp on a smaller scale, “Breaking the Warp Barrier: Hyper-Fast Solitons in Einstein-Maxwell-Plasma Theory” [duplicate]

So according to this paper it creates a warp drive without the need of negative energy to operate which many think does not exist in reality. So my question is what would you do to experimentally ...
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Why the Warp-drive uses a 3D shape to distort space instead of a 4D shape?

I know that warp-drives are just a theory and that they would require exotic mass (that is also a theoretical material), but, as said in this video, after some re-calculations, it was theorised that ...
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The center of energy of a closed system maintains constant velocity in the vacuum of space. How can a warp drive overcome this rule?

In the following paper Introducing Physical Warp Drives by Alexey Bobrick, Gianni Martire they state 5.2. Constructing warp drives: Warp drives, being inertially moving shells of normal or exotic ...
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Does frame dragging expand the fabric of spacetime?

I have read a bit about frame dragging, and how you can have a negative energy at the edge of black hole because of flipping of a one space dimension with time (theoretically) But was curious tho if ...
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Will an Alcubierre Drive arrive before a beam of light, if sent between two stationary observers?

First, I'm not a physicist, just an engineer, and my first language is not English, so forgive any strange wording. I have a simple thought experiment about Alcubierre Drives: Imagine two stationary ...
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Compressing the Earth to a 20-meter-wide sphere would only subtract one hour of time? (General relativity)

The Internet has exploded with news that the Applied Physics Institute of New York published a paper claiming that superluminal speeds can be achieved using a type of Alcubierre Drive, but without the ...
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Could LIGO detect an Alcubierre drive being used within 10 light-years of the Solar system? [closed]

Maybe this question is too speculative... But is it possible that LIGO would detect the ramp-up and ramp-down of an Alcubierre drive being used within 10 light-years of the Solar system? Also, if the ...
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Warp drive causality issue, and a possible error in a paper?

Take a look at this paper on "Warp Drives and Causality:" https://doi.org/10.1103/PhysRevD.53.7365 The author attempts to argue that the Alcubierre Drive spacetime could exhibit Closed ...
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In an Alcuibierre like warp drive, what is the velocity of the object after the warp trip?

Presume a ship is traveling in an Alcubierre-like warp bubble. For concreteness, let us say that it began in a geostationary orbit (that term is used to indicate that the ship is in fact orbiting ...
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Late time behaviour of the Alcubierrie warp drive metric

The Alcubeierrie Warp Drive metric looks like $$ds^2 = -dt^2+(dx-Xdt)^2+dy^2+dz^2$$ where $X = v_s(t)f(r_s)$ and $r_s = [(x-x_s(t))^2+y^2+z^2]^{1/2}$. Now, $f(r_s) \approx 1 \quad 0 < r < R$ ...
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Geodesics in an Alcubierrie Warp Drive metric

The geodesics in an Alcubierrie Warp Drive metric are given by $$\dot{t} = 1 \quad \dot{x} = X\dot{t} \quad y, z = \text{constant}$$ where $X = \dot{x}_s(t) f(r_s)$. Here $f(r_s)$ is a shape function ...
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Is this solution for interstellar travel viable?

I have in mind a way to enable FTL travel. Is this way viable? In the paper: "Weighing the vacuum with the Archimedes experiment" we can see the dependency of the gravitational repulsion ...
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Frame dragging Warp drive [closed]

Is it possible to use frame dragging to make a warp drive? For example: a space ship with "frame dragging generators" that constructively interfere between them to let space be dragged in ...
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Dark energy as negative matter for Alcubierre drive

Can dark energy be used for the Alcubierre drive as a substitute for negative mass? After all, to make the Alcubierre drive work, it is necessary to expand the universe behind it, and that is what ...
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The Explosive Force of the Braking Alcubierre Drive - What would this look like? [closed]

The Alcubierre Drive and faster than light travel more generally may be locked away in the realm of fiction forever. That might be depressing to some people but I think their impossibility is really ...
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Alcubierre drive: what is the nature of exotic matter? [closed]

In connection with Alcubierre drive we often hear about necessity of an exotic matter in order to produce a negative energy density. I suspect that such matter has no place in standard particle model. ...
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What would a Natario Warp Drive look like, outside & inside the warp bubble?

Within a Natario Warp Metric, all mass in front of the ship is pushed outwards by it's negative energy density, this means no light would interact with the front of the ship at all. And since the ...
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In regards to the hypothetical Alcubierre Drive (hear me out), are energy costs consumed immediately, or during transit?

I am aware the Alcubierre Drive is highly hypothetical and likely cannot exist. However, there are significant quantities of research material into Warp Drives of many types, and presumably the answer ...
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Approach for calculating Alcubierre energy function?

NOTE: I know that the Alcubierre drive is on shaky ground and I'm not asking about its practicality or physical feasibility. I'm also not looking for answers like, "It's sci-fi so you can just make it ...
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What would be the energy requirements for non FTL warp drive? [closed]

I have a question about Alcubierre Drive, or other Warp Drive concepts. I have read a lot about FTL warp drive and the massive energy requirements to perform a jump, varying from bigger than the ...
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Since gravitational waves travel at the speed of light how are Alcubierre warp drives possible?

There are clearly some very large technical challenges to overcome before actually making one but most writers seem to think Alcubierre warp drives are possible in principle. They work by propagating ...
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How would an Alcubierre warp bubble be affected by external gravitational fields (e.g. black holes)?

Consider a spaceship inside an Alcubierre warp bubble traveling in a straight trajectory. As it travels, it passes near a black hole (for the sake of argument, we'll say it's near the event horizon of ...
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Computing Riemann tensor components for Alcubierre metric

I am currently trying to compute the Riemann tensor components for the Alcubierre metric, and already, on the computation of the first component, I'm running into some issues. The trouble component in ...
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Alcubierre metric without geometrized units

In the beginning of Alcubierre's paper, he defines his metric with the use of geometrized units ($G = c = 1$). While it makes the math simpler, it seems to hide the physical numbers away, leaving me ...
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Maximum Speed for Space Travels

Considering a hypothetical spaceship that has an unlimited amount of fuel, traveling within the solar system planetary plane, what would be considered a safe maximum speed for traveling around ...
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Theoretical question on frames of reference

Some friends (all engineers - not scientists) watching Star Trek and discussing the science behind it. Not whether warp drive or aliens or anything like that were real.... No our discussions were on ...
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What is a good way to visualize the movement of an Alcubierre drive? [closed]

So I know that an AD works by pinching space-time in front of the ship and expanding it behind the ship. A good way to describe gravity is having a blanket stretched out on all four corners and ...
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Poor man's Alcubierre drive?

In general relativity,  the fundamental notions are the curvature (Ricci tensor) and the stress energy tensor. Energy density and curvature are connected .  The Casimir vacuum between parallel plates ...
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Warping Space Time By Focusing on Getting Smaller Rather Than More Energy?

So all energy/mater warps space-time, right? However, whenever we talk about the human manipulation of space-time it is a far-off goal requiring nothing short of tremendous amounts of energy and ...
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Minimum Amount of Negative Energy required in Warp Drive Spacetimes

In the pioneering work of Alcubierre, to power a warp drive-like geometry it is necessary to employ an amount of negative energy larger (in absolute value) than the whole observable universe mass. A ...
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No FTL information implies no FTL travel?

The general consensus in the scientific community is that it is impossible to transmit information faster than light. There is also speculation that it might be possible to open wormholes or travel ...
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How can the Alcubierre drive itself move faster than light?

Assume that we have constructed an Alcubierre drive (we somehow managed to overcome all the difficulties). Now we want to want to move an object from galaxy A to galaxy B. We place it in the ...
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Einstein field equations to the Alcubierre metric

I was wondering how Alcubierre derived the metric for the warp drive? Sources have said it's based on Einstein's field equations, but how did he go from this to the metric?
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Does localized space contraction occur?

There's the general space expansion due to dark energy and it acts in areas that aren't gravitationally bound. There's gravitational distortion of space around massive bodies, which also adds space. ...
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Question about literature of Alcubierre's drive

In the last words of the prepaper*, Mr Alcubierre says: As a final comment, I will just mention the fact that even though the spacetime described by the metric (8) is globally hyperbolic, and ...
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If the Higgs Boson and Higgs Field could be manipulated, could that potentially make $m=0$ in all physics equations? [closed]

The Higgs Field and Higgs Boson are theorized to be responsible for mass, or $m$. If these could be manipulated, altered, or controlled for, if the Higgs Field could somehow be parted, would this ...
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How would items consumed by an Alcubierre Drive warp bubble pass?

Sorry in advance for my lack of physics knowledge, but I have a question as relates to the theory of Alcubierre drives and warp bubbles. If I understand this I might be able to "get it". Let's ...
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Alcubierre-White warp drive energy consumption

I can't find any place that gives a number other than for a $10c$, 8 lightyear trip being something like 68 exajoules (off the top of my head, might be wrong). I'm sure the math would tell me this if ...
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Can Alcubierre Space Drive function in space time within event horizon of a Black Hole?

Alcubierre Drive compresses space in front and propagates as such but in a singularity where space is untraversable is propagation possible? If so can you prove it?
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Can spacetime warp at a rate faster than light?

If you could decrease the distance between here and the nearest star by, say, four light years, wouldn't it take four years for that distance to disappear? For this reason, wouldn't so called "warp ...