English

Regular black holes in three dimensions

General Relativity and Quantum Cosmology 2021-07-07 v1 High Energy Physics - Theory

Abstract

We find a plethora of new analytic black holes and globally regular horizonless spacetimes in three dimensions. The solutions involve a single real scalar field ϕ\phi which always admits a magnetic-like expression proportional to the angular coordinate. The new metrics, which satisfy gttgrr=1g_{tt}g_{rr}=-1 and represent continuous generalizations of the BTZ one, solve the equations of Einstein gravity corrected by a new family of densities (controlled by unconstrained couplings) constructed from positive powers of (ϕ)2(\partial \phi)^2 and certain linear combinations of RabaϕbϕR^{ab} \partial_a \phi \partial_b \phi and (ϕ)2R(\partial \phi)^2 R. Some of the solutions obtained describe black holes with one or several horizons. A set of them possesses curvature singularities, while others have conical or BTZ-like ones. Interestingly, in some cases the black holes have no singularity at all, being completely regular. Some of the latter are achieved without any kind of fine tuning or constraint between the action parameters and/or the physical charges of the solution. An additional class of solutions describes globally regular and horizonless geometries.

Keywords

Cite

@article{arxiv.2104.10172,
  title  = {Regular black holes in three dimensions},
  author = {Pablo Bueno and Pablo A. Cano and Javier Moreno and Guido van der Velde},
  journal= {arXiv preprint arXiv:2104.10172},
  year   = {2021}
}

Comments

11 pages, 2 figures

R2 v1 2026-06-24T01:22:47.857Z