3 ms·
This is very interesting, because: >Einstein denied several times that black holes could form. In 1939 he published a paper that argues that a star collapsing
by josu 13y ago
This is very interesting, because:
>Einstein denied several times that black holes could form. In 1939 he published a paper that argues that a star collapsing would spin faster and faster, spinning at the speed of light with infinite energy well before the point where it is about to collapse into a black hole.
http://en.wikipedia.org/wiki/Einstein's_unsuccessful_investigations http://en.wikipedia.org/wiki/Einstein's_unsuccessful_investi...
- 3pt14159 13y agoI was always taught that black holes were actually disks due to angular momentum and the speed of light. The matter at the end of the disk is being pulled in by gravity, but its speed is so close to C that its mass increases to the point where the equations balance out (trade gravitational potential energy for mass potential energy + kinematic potential energy).
- mistercow 13y agoI'm don't think that's particularly relevant. Einstein's objection was wrong, and what Hawking is saying is pretty much unrelated.
- kissickas 13y agoIsn't he still saying that black holes exist in that sense, though? According to the article (haven't looked at the paper), it looks like Hawking's new "apparent horizon" could still trap light, and it would only escape as Hawking radiation, which sounds contrary to Einstein's above quote.
- alphaBetaGamma 13y agoWe have exact solution to spinning black holes (discovered after Einstein's death) which settles that question. http://en.wikipedia.org/wiki/Kerr_metric http://en.wikipedia.org/wiki/Kerr_metric