English

Nonsingular Black Holes in $4D$ Einstein--Gauss--Bonnet Gravity

General Relativity and Quantum Cosmology 2022-04-19 v2

Abstract

Recently, several methods have been proposed to regularize a D4D \to 4 limit of Einstein-Gauss-Bonnet (EGB), leading to nontrivial gravitational dynamics in 4D4D. We present an exact nonsingular black hole solution in the 4D4D EGB gravity coupled to non-linear electrodynamics and analyze their thermodynamic properties to calculate precise expressions for the black hole mass, temperature, and entropy. Because of the magnetic charge, the thermodynamic quantities are corrected, and the Hawking--Page phase transition is achievable with diverges of the heat capacity at a larger critical radius r=r+Cr=r_{+}^{C} in comparison to the 5D5D counterpart where the temperature is maximum. Thus, we have a black hole with Cauchy and event horizons, and its evaporation leads to a thermodynamically stable extremal black hole remnant with vanishing temperature, and its size is larger than the 5D5D counterpart. The entropy does not satisfy the usual exact horizon Bekenstein--Hawking area law of general relativity with a logarithmic area correction term.

Keywords

Cite

@article{arxiv.2004.01131,
  title  = {Nonsingular Black Holes in $4D$ Einstein--Gauss--Bonnet Gravity},
  author = {Arun Kumar and Dharmanand Baboolal and Sushant G. Ghosh},
  journal= {arXiv preprint arXiv:2004.01131},
  year   = {2022}
}

Comments

5 figures, 3 tables. This was an invited manuscript published in the special issue "Dark Matter and Dark Energy: Particle Physics, Cosmology, and Experimental Searches". Matched to published version

R2 v1 2026-06-23T14:37:05.394Z