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seen Nov 24 '13 at 15:37

Sep
10
awarded  Yearling
Sep
7
comment Current status of Penrose-Hawking “thunderbolts?”
OK, just in case you think is interesting anyway, they have a more detailed paper: arxiv.org/abs/1012.0077
Sep
7
comment Current status of Penrose-Hawking “thunderbolts?”
Well I meant "didn't perform"
Sep
7
comment Current status of Penrose-Hawking “thunderbolts?”
End of page 3 of the preprint: on the last ray, our simulations showed that curvature remains finite. Thus, contrary to wide spread belief, based in part on [3], and in contrast to simplified and soluble models, there is no ‘thunderbolt singularity’ in the metric. Where [3] is arXiv:hep-th/9207105. But I didn't read carefully the question, I just wanted to report this recent paper. I initially even thought that @MBN was complaining that they didn't performed a full Quantum Gravity computation ;)
Sep
7
comment Current status of Penrose-Hawking “thunderbolts?”
If you search in the text you'll find that they comment on the issue:
Sep
7
comment Current status of Penrose-Hawking “thunderbolts?”
What can I do about it?
Sep
7
answered Current status of Penrose-Hawking “thunderbolts?”
Feb
23
awarded  Nice Answer
Dec
6
comment Does General Relativity encompass Special Relativity?
As Stan said, your last sentence is not correct. There are non flat solution of GR with no matter at all: black holes for example.
Nov
26
awarded  Caucus
Oct
6
answered When a neutral star with a magnetic field collapses to form a black hole, what happens to the magnetic field?
Sep
8
revised Why is there an escape velocity?
Fixing typo
Sep
8
comment Why is there an escape velocity?
Always my monkey-manners, I shouldn't write answers while eating bananas. Thanks to David for the edit and @lusken you are right of course, based on the previous paragraph I meant to write 2 $-\frac{1}{2}$ $-\frac{1}{4}$ ...
Sep
8
awarded  Enthusiast
Sep
7
answered Why is there an escape velocity?
Aug
30
comment In 't Hooft beable models, do measurements keep states classical?
@Ron Is it possible that the question is "wrong"? Couldn't one take the opposite point of view? Couldn't the question be: is bayesian reduction in the CA states probability able to reproduce the projection to an eigenstate of an internal subsystem to some very good approximation? Isn't this the same thing as the decoherence interpetation of the "collapse of the wave-function" where the density matrix of the subsystem becomes diagonal because it gets entangled with a macroscopic apparatus that measures that observable? (just a thought, I didn't follow the details, I might be missing something)
Aug
28
revised String theory and trace anomaly in semiclassical gravity?
added 526 characters in body
Aug
22
comment String theory and trace anomaly in semiclassical gravity?
Some comments of Ron Maimon regarding the stress-energy tensor appeared here some time ago, trying to push the discussion in the right direction and now they disappeared... what happened? I guess I should also probably update the question to make it clearer.
Aug
20
awarded  Critic
Aug
18
awarded  Yearling