N\"other Currents, Black Hole Entropy Universality and CFT Duality in Conformal Weyl Gravity

TL;DR

This paper investigates black hole entropy in Conformal Weyl gravity, revealing non-universality across solutions, and constructs a near horizon CFT dual using an $AdS_2/CFT_1$ correspondence, linking entropy, anomalies, and symmetries.

Contribution

It computes black hole entropy for new solutions in Conformal Weyl gravity and constructs a near horizon CFT dual, highlighting non-universality and the role of the Weyl anomaly parameter.

Findings

Black hole entropy varies across solutions, showing non-universality.

Wald's entropy formula aligns with computed entropies for specific solutions.

A near horizon $AdS_2/CFT_1$ dual is constructed, incorporating a parameter related to Weyl anomalies.

Abstract

In this paper we study black hole entropy universality within the Conformal Weyl gravity paradigm. We do this by first computing the entropy of specific vacuum and non-vacuum solutions, previously unexplored in Conformal Weyl gravity via both the N\"other current method and Wald's entropy formula. For the vacuum case, we explore the near horizon near extremal Kerr metric, which is also a vacuum solution to Conformal Weyl gravity and not previously studied in this setting. For the non-vacuum case we couple the conformal Weyl gravity field equations to a near horizon (linear) $U(1)$ gauge potential and analyze the respective found solutions. We highlight the non-universality of black hole entropy between our studied black hole solutions of varying symmetries. However despite non-universality, the respective black hole entropies are in congruence with Wald's entropy formula for the specific gravity theory. Finally and despite non-universality, we comment on the construction of a near horizon CFT dual to one of our unique non-vacuum solutions. Due to the non-universality, we must introduce a parameter (similarly to entropy calculations in LQG) which we also call $\gamma$ and relating to the Weyl anomaly coefficient. The construction follows an $AdS_2/CFT_1$ correspondence in the near horizon, which enables the computation of the full asymptotic symmetry group of the chosen non-vacuum conformal Weyl black hole and its near horizon quantum CFT dual. We conclude with a discussion and outlook for future work.