A smooth road to bumpy horizons: shaping black holes with non-linear sigma models, from supergravity to higher dimensions

TL;DR

This paper develops new solutions in General Relativity coupled with non-linear sigma models, including various black holes, stars, and cosmologies in higher dimensions, some of which are embedded in supergravity, expanding the landscape of known gravitational configurations.

Contribution

It introduces a broad class of solutions with bumpy horizons and anisotropic features, utilizing first-order BPS relations, some of which are embedded in supergravity and extend previous models.

Findings

Constructed neutral, charged, and magnetized black holes with bumpy horizons.

Presented time-dependent solutions in 2+1 dimensions.

Extended solutions to higher dimensions including black strings and p-branes.

Abstract

We construct new families of solutions for General Relativity coupled to a general class of non-linear sigma models, some of which can be embedded in supergravity. The solutions include neutral, charged and magnetized black holes with bumpy horizons, bumpy stars, and anisotropic cosmologies in $d\geq 4$ dimensions, as well as black strings and black $p$-branes. We also present a family of time-dependent solutions in $2+1$-dimensions. The construction relies on a set of first-order Bogomol'nyi-Prasad-Sommerfield relations for the coset scalars, that were recently exploited for the construction of bumpy black holes on the non-linear sigma model with homogenous target $SU(2)/U(1)$ in 2601.22914 [hep-th].