All Questions
Tagged with faster-than-light black-holes
45
questions
-2
votes
1
answer
89
views
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 ...
-4
votes
1
answer
76
views
What would happen if two super-massive black holes collide faster than the speed of light? [closed]
I know objects can't move through space faster than light. But there's no law against the expansion of the universe increasing the distance between two objects faster than the speed of light. But this ...
- 101
1
vote
1
answer
330
views
What is innermost unstable circular orbit (IUCO)?
In the paper Tachyon motion in a black hole gravitational field by V. M. Lipunov he writes:
(…) Circular orbits for tachyons begin at the distance of $ 3/2~r_g $, i.e., at the distance of the ...
- 1,948
1
vote
1
answer
152
views
Different Escape Velocities of Black Holes?
I am no physics major nor math major to this but merely an amateur cosmology enthusiast, so in my previous inquiries I wasn't able to find anything on the premise that if all black holes obviously ...
- 29
17
votes
2
answers
5k
views
Space falling faster than light after it falls inside the event horizon of a black hole?
Typing my question directly so people know what I am asking, afterwards providing background and context.
Q: What does it mean when space is falling, faster than light?
(I am specifically wondering ...
- 398
1
vote
2
answers
1k
views
If spacetime can expand faster than the speed of light, then can a black hole do that too?
I have read this question:
Yes, the expansion of space itself is allowed to exceed the speed-of-light limit because the speed-of-light limit only applies to regions where special relativity – a ...
- 29k
48
votes
7
answers
6k
views
Can you exit the event horizon with a rocket?
The reason given in most places about why one cannot escape out from an event horizon is the fact that the escape velocity at the event horizon is equal to the speed of light, and no one can go faster ...
- 603
3
votes
5
answers
476
views
Speed due to gravity [duplicate]
Assuming a miraculous arrangement of a string of black holes for slingshot purpose, and a solid ball slinging by these black holes one after the other, gaining speed with each slingshot, is it ...
- 4,479
0
votes
1
answer
92
views
Can the surface of a neutron star move faster than light? How length contraction manifests there?
It is known that any Kerr black hole is surrounded by ergosphere, inside which everything rotates around the black hole faster than light. Since ergosphere is greater than event horizon, one can ...
- 11.2k
-1
votes
1
answer
337
views
What would happen if a black hole disappeared? [closed]
Imagine if a black hole disappeared. Would spacetime act like a rubber band and propel objects that used to be caught in its gravitational field outwards - i.e. some kind of space time explosion? How ...
- 131
10
votes
2
answers
5k
views
Indirectly breaking the speed of light
Imagine a system of two objects: a supermassive black hole mass of approximately $10^{36}$ kg and another $1$ kg object revolving around the black hole with an average mean distance of about $1.5×10^{...
- 483
1
vote
0
answers
35
views
If a black hole bends light what does to a beam that arrives at a zero degree angle directly towards the singularity? [duplicate]
We can only speculate what is going on but does the black hole singularity make the light arrive faster than it would in space not affected by gravity?
- 1,815
-5
votes
1
answer
81
views
What happens if an object spins faster than light? [closed]
Does a star disappears from space time, if it spins faster than light?
- 1
0
votes
1
answer
211
views
Black holes, and faster than light communication
Lets say we have a black hole that has a diameter > 1 light year and we can somehow push and pull this black hole {though the push and pull itself can never exceed lightspeed of course}.Will the other ...
0
votes
1
answer
276
views
Escape a black hole by tunneling faster then the speed of light [closed]
I do understand that nothing can escape a BH (not particles, no information), and this question is not about why you cannot escape. This question is not about Hawking radiation, and I do understand ...
- 29k