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)

Filter by
Sorted by
Tagged with
0
votes
1answer
57 views

Alcubierre drive: what is a 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 susspect that such matter has no place in standard particle model....
1
vote
0answers
52 views

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 ...
2
votes
1answer
50 views

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 ...
1
vote
0answers
50 views

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 ...
1
vote
1answer
85 views

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 ...
1
vote
1answer
60 views

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 ...
1
vote
0answers
31 views

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 ...
0
votes
1answer
62 views

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 ...
2
votes
1answer
71 views

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 ...
1
vote
1answer
74 views

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 ...
0
votes
1answer
54 views

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 ...
1
vote
0answers
37 views

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 ...
2
votes
3answers
183 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 ...
1
vote
2answers
70 views

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 ...
0
votes
1answer
56 views

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 ...
8
votes
4answers
2k views

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 ...
1
vote
2answers
514 views

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 ...
9
votes
2answers
1k views

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?
1
vote
1answer
67 views

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. ...
2
votes
1answer
71 views

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 ...
0
votes
2answers
1k views

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 ...
1
vote
1answer
245 views

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 ...
2
votes
2answers
3k views

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 ...
0
votes
1answer
106 views

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?
1
vote
1answer
108 views

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 ...
0
votes
2answers
170 views

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 ...
3
votes
2answers
537 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 ...
2
votes
3answers
621 views

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 ...
1
vote
0answers
123 views

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://...
0
votes
2answers
378 views

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 ...
1
vote
2answers
354 views

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 ...
1
vote
1answer
88 views

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 ...
12
votes
2answers
5k views

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 ...
0
votes
2answers
242 views

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", ...
0
votes
1answer
572 views

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 (...
3
votes
1answer
2k views

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 ...
1
vote
1answer
103 views

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 ...
-1
votes
1answer
68 views

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 ...
5
votes
1answer
288 views

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? ...
2
votes
1answer
183 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 ...
4
votes
0answers
153 views

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. ...
6
votes
3answers
616 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 ...
1
vote
2answers
255 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 ...
0
votes
1answer
2k 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 ...
1
vote
1answer
91 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 ...
-1
votes
1answer
64 views

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 ...
-1
votes
1answer
164 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 ...
3
votes
2answers
672 views

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 ...
0
votes
1answer
117 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 ...
1
vote
1answer
291 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: ...