Implications of a viscosity bound on black hole accretion

Details Implications of a viscosity bound on black hole accretion Implications of a viscosity bound on black hole accretion

2011-08-25

arxiv.org/abs/1108.5177v2

Phys. Lett. B709 (2012) 289-292

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages, 4 figures; version to appear in Physics Letters B

Scientific paper

Motivated by the viscosity bound in gauge/gravity duality, we consider the ratio of shear viscosity (eta) to entropy density (s) in black hole accretion flows. We use both an ideal gas equation of state and the QCD equation of state obtained from lattice for the fluid accreting onto a Kerr black hole. The QCD equation of state is considered since the temperature of accreting matter is expected to approach 10^{12}K in certain hot flows. We find that in both the cases eta/s is small only for primordial black holes and several orders of magnitude larger than any known fluid for stellar and supermassive black holes. We show that a lower bound on the mass of primordial black holes leads to a lower bound on eta/s and vice versa. Finally we speculate that the Shakura-Sunyaev viscosity parameter should decrease with increasing density and/or temperatures.

Affiliated with

Also associated with

No associations

Rating

Implications of a viscosity bound on black hole accretion does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Implications of a viscosity bound on black hole accretion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Implications of a viscosity bound on black hole accretion will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-501073