meta user
network profile
| bio | website | |
|---|---|---|
| location | Campinas, Brazil | |
| age | ||
| visits | member for | 2 years, 6 months |
| seen | Jun 22 '12 at 3:14 | |
| stats | profile views | 21 |
Undergraduate student in Mathematics and Physics.
|
Jun 26 |
comment |
Asymptotic Invariants in General Relativity On an unrelated topic, I was wondering if you have any thoughts on why ADM energy and momentum are the only possible $1/r$ invariants, or maybe you know a reference that touches on these matters? Thanks again. |
|
Jun 26 |
comment |
Asymptotic Invariants in General Relativity Hi Willie, thank you for your comments and for the reference. I should have thought that a general definition of angular momentum requires stronger fall-off conditions than the ones presented in the definition of asymptotic flatness, since otherwise it would be defined together with ADM energy and momentum in most references. But I certainly didn't expect for the problem to be so much trickier; for instance, in the paper you linked it is argued that one cannot choose arbitrary coordinates for then covariance of angular momentum cannot be guaranteed. |
|
Jun 25 |
awarded | Student |
|
Jun 25 |
asked | Asymptotic Invariants in General Relativity |
|
Jun 24 |
comment |
Can black holes form in a finite amount of time? @Anixx Yes. See the Schoen-Yau paper on formation of apparent horizons (the relevant result is theorem 2). |
|
Feb 12 |
awarded | Editor |
|
Feb 12 |
revised |
Can black holes form in a finite amount of time? added 1 characters in body |
|
Feb 12 |
awarded | Supporter |
|
Feb 12 |
answered | Can black holes form in a finite amount of time? |
|
Nov 20 |
comment |
Event Horizon violability? By topological sphere I mean a surface which is homeomorphic to a sphere. It does not need to be precisely spherical, all that is needed is that the Euler characteristic be 2. Of course, during the merging of the black holes the event horizon might deform, but at any time it is homeomorphic to a sphere, i.e., you can't create "holes" in it. |
|
Nov 20 |
awarded | Teacher |
|
Nov 20 |
answered | Event Horizon violability? |
