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Jan
29
comment Why does electron-positron annihilation prefer to emit photons?
Yes..but that doesn't actually answer my question. In the low energy limit why are photon pairs preferred over gravitons or neutrinos?
Jan
29
awarded  Student
Jan
29
asked Why does electron-positron annihilation prefer to emit photons?
Jan
28
answered What un-ionizes an electron after the photo-electric effect?
Jul
5
comment maximum rotational speed
A nice explanation can be found on pages 16 and 17 of this article by M. Camernzind and A. Muller. In essence, it is the speed that the black hole frame drags. It can't exceed the speed of light at the event horizon or you would no longer have an event horizon.
Jul
5
awarded  Teacher
Jul
3
answered maximum rotational speed