Explorations of Universality in the Entropy and Hawking Radiation of Non-Extremal Kerr AdS$_4$ Black Holes

TL;DR

This paper explores the microscopic origins of entropy and Hawking radiation in non-extremal Kerr AdS$_4$ black holes, demonstrating universality across different approaches and regimes.

Contribution

It applies covariant phase space and boundary CFT methods to unify microscopic explanations of black hole entropy at high temperatures.

Findings

Matching results from covariant phase space and boundary CFT approaches.

Qualitative agreement between supergravity and matrix model partition functions.

Hawking radiation rate universally proportional to horizon area at high temperatures.

Abstract

We comprehensively discuss various microscopic approaches to the Bekenstein-Hawking entropy for rotating, electrically charged, asymptotically AdS$_4$ non-extremal black holes in gauged supergravity. We apply the covariant phase space formalism to the near-horizon region to obtain a Cardy-formula-based microscopic explanation for the entropy, consistent with the Kerr/CFT correspondence. From the dual boundary CFT point of view, we estimate the free partition function in the matrix model approximation in the high-temperature regime and find qualitative agreement with the supergravity answer. All these different approaches match in the appropriate limits and support the universality of AdS black hole entropy even at high temperatures, far away from extremality. Prompted by the consistency of the results of statistical explanations for the AdS$_4$ black hole entropy, we discuss aspects of the rate of Hawking radiation at high temperatures from the CFT$_2$ perspective and found it to be universally proportional to the horizon area.