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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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3answers
141 views

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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“High-Frequency Gravitational Wave Generator” patent from U.S. Navy, among other things [closed]

A scientist going by the name Salvatore Cezar Pais, employed by the U.S. navy, was recently granted the following eyebrow-raising patents: -High frequency gravitational wave generator (10322827) -...
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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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Warped space and gravity

I'm trying to combine in my head a warped space (e.g. an Alcubierre "warp bubble") with the curved space of gravity. How do the two interact? More specifically, if a warp bubble moves near a source of ...
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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 ...
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Is the Alcubierre drive consistent with conservation of energy? (Gravitational potential in particular)

Consider a ship in a circular orbit around a planet. It activates an Alcubierre drive. Do the physics of this drive allow the ship to reach a greater distance from the planet, and if so, where does ...
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486 views

Derivation for Alcubierre Drive

Is there any online derivation for the Alcubierre Drive? I have looked at several papers and none of them actually derive the equations. They simply point them out. Particularly, I would like a ...
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3answers
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What would be the implications of faster-than-light travel? [closed]

In $1994$, Miguel Alcubierre, a theoretical physicist and long-time Star Trek fan proposed a mathematically-sound method of manipulating spacetime to allow for faster-than-light travel, essentially ...
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An oddity in the Alcubierre Drive

The Alcubierre Drive describes how a torus of negative mass is placed around a small object (usually a ship), while something like a black hole is placed in front in order to compress space (https://...
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Gravitational waves and negative pressure

I was recently reviewing an article published by Dr. Harold White and Dr. Eric Davis (as seen here) which summarized the creation and activity of negative pressure for a supposed place-filler for the ...
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Alcubierre Drive: Visibility

Suppose if you were standing still relatively looking at an active Alcubierre Drive. I am aware of the fact that if you are inside an Alcubierre bubble you would not be able to see outside of it. I ...
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Generalising a finding in Kaluza-Klein theory to extra spatial dimensions in super string theory a correct method?

As a disclaimer I am an A-level student. I have been doing a research project in which I am looking at manipulating space-time through the ideas provided by superstring theories. I stumbled upon the ...
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Does the Alcubierre drive have a theoretical upper speed limit?

Every now and then, it's claimed that the Alcubierre drive has an upper speed limit. While superluminal, this is often brought up as an argument why such a drive, even if it were to turn out to be ...
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Could antimatter be “negative matter”?

This question is inspired by an answer on WorldBuilding.SE. The question on worldbuilding is about the Alcubierre Drive, and the answer is a good one, pointing out that it requires "negative matter", ...
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Do Gravitational Waves disprove superluminal Alcubierre drive?

I am not a physicist. But... does the rate at which gravitational waves travel set an upper limit to the "speed" of a ship propelled with Alcubierre drive? Or does it present a relativistic trick (...
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Does Alcubierre drive allow time travel? [closed]

In Alcubierre drive, one can travel apparently faster than the speed of light by "compressing" space in front in the direction of travel. So let's say we have a stationary observer at point A, and an ...
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1answer
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Function to model deformed spacetime in 2D visualization of an Alcubierre drive

In the Wikipedia article on Alcubierre drive there is a top image. It is 2D visualization of an Alcubierre drive, showing the opposing regions of expanding and contracting space-time that displace the ...
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Since Alcubierre drive moves a flat region of space, does it mean that space acts lika a liquid? [closed]

The Alcubierre drive would move a patch of flat space through space and, leaving exotic matter aside, is mathematically correct. Does that means that space-time is not a "solid" lattice i.e. not ...
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If there is no speed limit on space-time compression, why do gravitational waves travel at light-speed?

From what I've read about spacetime and general relativity it seems there is no limit on how quickly space-time can be compressed or expanded. Why then gravitational waves are limited to light speed? ...
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1answer
178 views

How can I understand $\mathrm ds^2 = -c\,\mathrm dt^2 + [\mathrm dx-v_s(t)f(r_s)\mathrm dt]^2 +\mathrm dy^2 +\mathrm dz^2 $ in the simplest way?

How can I understand this equation $$\mathrm ds^2 = -c\,\mathrm dt^2 + [\mathrm dx-v_s(t)f(r_s)\mathrm dt]^2 +\mathrm dy^2 +\mathrm dz^2 $$ in the simplest way? I am a 13 year old boy who is totally ...
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Looking out from the inside of an Alcubierre bubble

Disregarding the difficulties in achieving a warp "bubble" as per Alcubierre's theoretical warp drive, as far as I understand it the geometry of the spacetime that arises is mathematically sound. ...
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598 views

“Warp-drive” thought experiment

Why wouldn't this "warp-drive" work? Assuming we can build a flywheel that can survive near light speed and have an onboard power storage or beamed energy that can spin it up to that speed and back ...
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2answers
244 views

Einstein field equations and SEM tensor + Alcubierre

I wonder how I can find, using the Einstein field equations, the SEM tensor in a region of space with a function $k(x,y,x)$ that describes the curvature of space in that region at a moment (so it is ...
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1answer
1k views

What are negative and positive energies? [closed]

So I have a few questions related to the negative and positive energy topic. 1)What do we mean by negative and positive energies in physics? 2)I have seen in a minute physics video that we need ...
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1answer
87 views

Could an Alcubierre Drive modify a gravitational field? [closed]

I'm a high school student, so I have no clue if warping spacetime has any effect on gravitational fields, but the two seemed to be linked based on what I've watched and read. And if a warp drive is ...
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1answer
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What do you see if you directly observe your destination while in warp? [closed]

Say you are traveling in a warp bubble towards Earth from 10,000 lightyears away with an ETA of 24 hours. On the front of your ship, you mount a high powered telescope pointed directly at Earth (your ...
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1answer
157 views

Warp Drive conundrum - Speculative science question [closed]

Let me begin by stating that this question about Warp Engines/Drives, which i understand is a speculative, also I am not a Professional scientist or someone with a degree in physics. The question will ...
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2answers
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Why is an Alcubierre drive shaped like it is

When I look up the Alcubierre drive I keep seeing that the drive powering the bubble is shaped like a circle - is this necessary for the creating of the "warp bubble" that travels forward? Does the ...
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1answer
109 views

What is the difference between the expansion of space and the Alcubierre drive?

The Alcubierre drive violates causality. As far as I know the expansion of space does not. The usual explanation for why space is allowed to go FTL is that the matter doesn't move. The Alcubierre ...
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1answer
275 views

How does a world line of an Alcubierre drive look like?

In my recent question ”Speed of light and warp drives in general relativity” I asked exactly how an Alcubierre drive worked and exactly what "FTL travel" meant. One of the comments I got stated that: ...
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Speed of light and warp drives in general relativity

Velocities can be a tricky thing in general relativity. A cool concept seemly consistent with the Einstein field equations) is an Alcubierre drive, described by the Alcubierre metric. However, I ...
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The effect of multiple Alcubierre rings

In all of the descriptions and visualizations I've ever seen of the Alcubierre drive but one, it takes the form of a single ring or toroid surrounding a spherical volume of flat space. The exception ...
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Exotic matter out of a “squeezed” vacuum?

In the light of the current warp field experiments by NASA I found this paper: http://arxiv.org/pdf/1005.5682v1.pdf Could this actually lead to the creation of exotic matter or at least strengthen ...
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Is every spacetime metric physically realizable?

Is every spacetime metric physically realizable? I know that given any spacetime metric, you could work out a stress-energy tensor for each position that would result in that metric. However, I also ...
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Would an Alcubierre drive actually allow FTL travel? [duplicate]

If I do not phrase this question right, please forgive me in advance because I am a layman on the subject of physics, but a software engineer, nonetheless. I do understand many technical subjects. ...
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1answer
122 views

Does the payload of an Alcubierre drive have to be on board during the preparation phase?

I was thinking about the practical aspect of using an Alcubierre drive, assuming one existed. I'm no expert, but my understanding is that, since the destination has to be in the forward light-cone of ...
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1answer
266 views

Can the Alcubierre Drive be explained by Gravitoelectromagnetism? [closed]

Even though there is no experimental evidence, that the Alcubierre drive works. The Einstein field equations permit this solution. For Gravitoelectromagnetism there are hints and ongoing efforts to ...
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0answers
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Does a mass gain inertia against movement in all directions as it approaches the speed of light?

If a mass moves along the x axis at near the speed of light, does it take as much energy to additionally accelerate the mass along the y axis as it does to accelerate it along the x axis by the same ...
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2answers
509 views

Alcubierre drive and inertia.

What is the inertia or velocity of a vehicle upon exiting or shutting down an Alcubierre bubble? Would the vehicle maintain the velocity it had in the bubble? I'm not sure I asked the question in a ...
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1answer
176 views

Can an underdensity in space act as a negative matter density powering a warp drive?

Consider a homogeneous isotropic universe filled with a perfect fluid with density $\rho$ and pressure $P = \rho/w$. E.g. for $w=-1$ we get a universe equivalent to one with "vacuum energy" or with ...