All Questions
Tagged with warp-drives space-expansion
6
questions
3
votes
2
answers
254
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 ...
4
votes
2
answers
141
views
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
13
votes
2
answers
3k
views
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
134
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. ...
- 2,988
1
vote
1
answer
174
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 ...
- 2,172
0
votes
1
answer
135
views
How does someone move space?
I've heard that we've known components of the universe appear to be flying apart faster than $c$, and that this can happen because the space containing these materials are also moving apart.
How does ...
- 525