Modified black hole solution with a background Kalb-Ramond field

TL;DR

This paper explores how a background Kalb-Ramond field causes Lorentz symmetry breaking, leading to modified black hole solutions with unique horizon structures and potential observable effects like temperature shifts.

Contribution

It introduces an exact power-law modified black hole solution influenced by Lorentz violation from a Kalb-Ramond field with non-minimal coupling.

Findings

Modified black hole solutions with inner horizons.

Lorentz violation mimics charge effects in black holes.

Upper bounds on Lorentz violation from perihelion tests.

Abstract

We study the gravitation effects on a static and spherically symmetric spacetime due to the vacuum expectation value (VEV) of a Kalb-Ramond field. The Kalb-Ramond VEV is a background tensor field which produces a local Lorentz symmetry breaking (LSB) of spacetime. Considering a non-minimal coupling between the Kalb-Ramond (VEV) and the Ricci tensor, we obtain an exact parameter-dependent power-law modified black hole. For a particular choice of the LSB parameter, the Lorentz violation produces a solution similar to the Reissner-Nordstrom, despite the absence of charge. The near-horizon geometry is modified by including a new inner horizon and shifting the Schwarzschild horizon. Asymptotically, the usual Minkowski spacetime with a background tensor field is recovered. The vacuum configurations are studied considering the energy conditions and the Lorentz violating source properties. By means of the mercury perihelion test, an upper bound to the local Lorentz violation (LV) is obtained, and its corresponding effects on the black hole temperature is investigated.