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 Curious
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1d
comment Can there exist an observer able to observe a collapse of a star into a black hole?
But doesn't that then imply that there are experiments we can perform that detect that a black hole has formed?
2d
accepted Can there exist an observer able to observe a collapse of a star into a black hole?
2d
comment Can there exist an observer able to observe a collapse of a star into a black hole?
If the theory predicts that nobody is able to experimentally verify that a black hole exists, then how do we know that they actually exist?
2d
comment Can there exist an observer able to observe a collapse of a star into a black hole?
So other than optically, can they perform some experiment that will show that matter has actually passed the event horizon and that there is a black hole even though they can't see it?
May
2
awarded  Curious
May
1
comment Are there characteristics that distinguish our universe?
Is that really true that they will end up in the same place? The universe may but the observers inside may not agree, as they got entangled with different outcomes of quantum experiments.
May
1
revised Can there exist an observer able to observe a collapse of a star into a black hole?
edited title
May
1
asked Can there exist an observer able to observe a collapse of a star into a black hole?
Apr
3
comment Does Alcubierre drive allow time travel?
Cool, thanks. ,
Apr
3
comment Does Alcubierre drive allow time travel?
Right. So if you were to shine a light in the direction of travel exactly at the time of departure the light would still arrive before you, correct?
Apr
3
accepted Does Alcubierre drive allow time travel?
Apr
3
comment Does Alcubierre drive allow time travel?
Interesting, I thought that being within GR would somehow prevent you from time traveling as you don't locally exceed the speed of light.
Apr
3
answered Physical meaning of $Tr(\rho ^2)$
Apr
3
asked Does Alcubierre drive allow time travel?
Oct
11
comment Why are some galaxies flat?
Why doesn't this happen to dark matter? Doesn't it still interact gravitationally?
Sep
1
comment Speed distribution of objects in the universe
What do you mean by objects? Are we taking macroscopic bodies, or does this include molecules/atoms?
Aug
20
awarded  Yearling
Oct
25
suggested rejected edit on Percent error calculations dilemma
Oct
23
comment Second Qubit Not Flipped in Hadamard Gate
What you have here is the matrix applied to the first qubit only. This is shorthand for writing $H\otimes 1$. This tensor product yields a 4x4 matrix.
Aug
20
awarded  Yearling