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

A

bstract

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 ≥ 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 homogeneous target SU(2)/U(1) in arXiv:2601.22914.