Why is Black Hole Entropy Affected by Rotation?

Brett McInnes

doi:10.1007/JHEP02(2023)072

paper

Why is Black Hole Entropy Affected by Rotation?

arXiv:2210.11751 · doi:10.1007/JHEP02(2023)072

Abstract

It is well known that an asymptotically flat four-dimensional Kerr black hole has a smaller (specific) entropy than a Schwarzschild black hole of the same mass. We show here that the same is true if the temperature, rather than the mass, is held fixed; and we also show that an asymptotically AdS $_{5}$ -Kerr black hole has a smaller specific entropy than an AdS $_{5}$ -Schwarzschild black hole of the same temperature, except in a negligibly small class of special examples. The AdS $_{5}$ -Kerr case is particularly interesting, because here the gauge-gravity duality applies; if we further accept that there is a useful analogy between the strongly coupled field theories dual to AdS black holes and the best-understood example of a strongly coupled fluid (the Quark-Gluon Plasma), then we can apply QGP theory to predict the behaviour of black hole entropy in this case. The prediction agrees with our study of AdS $_{5}$ -Kerr entropy. The hope is that such results might lead ultimately to an identification of black hole microstates.

arXiv commentAdded a useful reference (arXiv:2010.03575 [hep-th]); 32 pages, 12 figures

Why is Black Hole Entropy Affected by Rotation?

Abstract

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