All Questions
Tagged with faster-than-light warp-drives
56
questions
3
votes
2
answers
84
views
How is Alcubierre's warp drive propeled forward?
What is the exact mechanism of the warp drive that propels it forward? I know that it creates negative pressure behind it and a positive pressure in front of it but how does this actually propels it ...
- 165
5
votes
1
answer
90
views
Would the effective speed of an Alcubierre drive be limited by the propagation speed of gravity?
The idea of a warp drive is to "expand space behind the ship and contract it in front"- in this way reaching a target destination faster than one could conventionally. However, the actual ...
- 87
3
votes
2
answers
252
views
How does the "York time" measure the expansion of space; why is it equal to the divergence of the comoving observer's four velocity for warp drive?
The mysterious York time, θ is important in warp drive topic. It is plotted on the famous diagrams and is considered the measure of the mechanism that "drives" the warp drive bubble at ...
-2
votes
1
answer
89
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Will this hypothetical circular singularity FTL travel warp drive work? [closed]
Not a physicist, but just wanted to know if this would work in theory:
Since nothing can practically travel faster than the speed of light (for now until proven otherwise), the only way for ...
6
votes
1
answer
356
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Are there any Alcubierre Style metrics for sub-luminal speed warp drives?
In most literature I have found, research into the Alcubierre Metric, and Warp Drives seems to be highly focused on the plausibility of superluminal travel.
Today I was thinking to myself that maybe ...
- 481
1
vote
1
answer
149
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Why does the Alcubierre drive need a negative energy ring specifically?
Now, maybe this is a result of my poor understanding of spacetime, but a theoretical warp bubble contracts space in front, and expands it in the back. Positive energy always contracts, so I get the ...
- 333
4
votes
2
answers
141
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Is the kind of physics proposed for "warp drive" related to the way that space really is expanding?
As I understand, some parts of Universe really are moving faster than light -- is this expansion something we think we can create artificially?
And if we can do this artificially, could it be done a ...
- 2,238
-2
votes
1
answer
403
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Why would FTL travel break causality, as oppose to the relative time reconciling as in the Twin Paradox? [duplicate]
I have heard that if faster than light travel were ever made possible, such as by an Alcubierre drive, the user would be taken backwards in time, violating causality.
This is odd to me, as it already ...
- 719
13
votes
2
answers
3k
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Why does an Alcubierre drive, travelling FTL, violate causality, if the universe expanding FTL doesn't?
An Alcubierre drive seems to be plausible as a means to travel faster than light, because
it doesn't move the object itself, but the space around it.
it's said that matter and information can't move ...
- 151
1
vote
1
answer
115
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Could Gott's Cosmic String Time Machine hypothetically be used as a poor man's Alcubierre drive?
I have read much speculation about Gott's theoretical use of cosmic strings for time travel, but if the colliding cosmic strings accelerated the spacecraft faster than light, as Gott theorizes, could ...
- 719
3
votes
0
answers
229
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How warp drive could be faster than light? [closed]
If the speed of gravity is as fast as the speed of light then there is no way a warp drive could curve the fabric of spacetime faster than the speed of light. Then how does a warp drive actually make ...
- 141
8
votes
3
answers
664
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How to make a warp bubble moving?
In answer to this question it is stated that:
In summary, warp drives move because they already move, or else they need to propel, and their movement is not related to spacetime expansion or ...
- 1,115
1
vote
2
answers
284
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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...
...
- 1,803
-1
votes
4
answers
588
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Does this research paper prove that warp drives are impossible? [closed]
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 ...
- 69
0
votes
0
answers
50
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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 ...
- 69