- #1
Harenil
- 8
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So I was calculating the temperature for a extremal Kerr black hole. G2*M2 = a2, where a = J/m. Using T = kappa / 2 /Pi... I'm assuming this is the correct approach. But my question is...
The surface gravity of an extremal Kerr black hole appears to be zero, leading to a zero temperature. Well, this baffles me, but seems to point to the non existence of extremal black holes in the physical universe. In my GR class we discussed the possibility of creating a naked singularity by hurling additional momentum into a black hole, and decided that it was simply impossible, but we never stated whether or not an extremal black hole could be formed. It seems that as a2 approaches G2*M2, the surface gravity, and thus the temperature drops. This seems counter intuitive to me, and points to a likely possibility that astrophysical Kerr black holes have a near zero surface temperature. Anyone care to shed some light/insight on the subject?
Daniel
The surface gravity of an extremal Kerr black hole appears to be zero, leading to a zero temperature. Well, this baffles me, but seems to point to the non existence of extremal black holes in the physical universe. In my GR class we discussed the possibility of creating a naked singularity by hurling additional momentum into a black hole, and decided that it was simply impossible, but we never stated whether or not an extremal black hole could be formed. It seems that as a2 approaches G2*M2, the surface gravity, and thus the temperature drops. This seems counter intuitive to me, and points to a likely possibility that astrophysical Kerr black holes have a near zero surface temperature. Anyone care to shed some light/insight on the subject?
Daniel