Tagged Questions
2
votes
2answers
175 views
What is the current radius of cosmological event horizon?
Doing some crude calculations (using the value of $H_0$ at this point of time only, since it is time dependent but not distance dependent thanks to Johannes answer) what is the radius of cosmological ...
0
votes
2answers
79 views
Causal reconnection
Can causally disconnected regions join up again? For example the universe is expanding faster than light creating cosmological horizon, but what if something causes the expansion to slow down and ...
4
votes
1answer
173 views
Will acceleration rate of expansion of space become faster than speed of light?
From watching cosmology lectures, it seems that the space between galaxies is expanding at an accelerating rate, my question is since it is the space that is (acceleratingly expanding), the special ...
3
votes
1answer
178 views
Could a ship equipped with Alcubierre drive theoretically escape from a black hole?
Also could it reach parts of the universe that are receding faster than the speed of light from us?
7
votes
2answers
211 views
Is the observable region of the universe within the event horizon of a super-massive black hole?
Observations:
I have read that for a free-falling observer within the event
horizon of a black hole that all lines of sight will end at the
singularity which is black.
I also look up and see that ...
6
votes
4answers
452 views
de sitter cosmologic limit
It has been said that our universe is going to eventually become a de sitter universe. Expansion will accelerate until their relative speed become higher than the speed of light.
So i want to ...
