Revisiting black holes and their thermodynamics in Einstein-Kalb-Ramond gravity

TL;DR

This paper explores black hole solutions and thermodynamics in Einstein-Kalb-Ramond gravity, revealing new classes of solutions and clarifying the role of Noether mass in the theory.

Contribution

It provides two new classes of exact black hole solutions in EKR gravity and analyzes their thermodynamic properties using the Wald formalism.

Findings

Derived two classes of static black hole solutions with various topologies.

Computed the Noether mass and entropy, confirming the first law of thermodynamics.

Discussed observational implications of the Noether mass in EKR gravity.

Abstract

Einstein-Kalb-Ramond (EKR) gravity is an alternative theory in which a rank-two antisymmetric tensor field, the Kalb-Ramond field, is nonminimally coupled to gravity, potentially generating Lorentz-violating backgrounds. In this work, we revisit black hole solutions and thermodynamics in EKR gravity, addressing subtleties overlooked in previous studies. We obtain two distinct classes of exact static black hole solutions with general topological horizons in diverse dimensions, both with and without a cosmological constant, corresponding to different coupling sectors dictated by the field equations. We analyze their thermodynamic properties and, using the Wald formalism, compute the Noether mass and entropy, establishing the first law and clarifying the role of the Noether mass. Finally, we discuss the implications of this definition of mass for observational constraints in EKR gravity.