Dimensional reduction of BPS attractors in AdS gauged supergravities

TL;DR

This paper explores how BPS attractors in gauged supergravities across various dimensions can be related through dimensional reduction, revealing connections to string theory embeddings and matching entropy calculations.

Contribution

It demonstrates the dimensional reduction of BPS attractors in gauged supergravities and relates higher-dimensional solutions to lower-dimensional black holes with string theory interpretations.

Findings

Relation between 5d black strings and 4d black holes established

Lower-dimensional solutions have string theory embeddings

Cardy formula matches Bekenstein-Hawking entropy

Abstract

We relate across dimensions BPS attractors of black strings and black holes of various topology in gauged supergravities with nontrivial scalar potential. The attractors are of the form AdS$_{2, 3} \times \Sigma^{2, 3}$ in 4, 5, and 6 dimensions, and can be generalized to some higher dimensional analogs. Even though the attractor geometries admit standard Kaluza-Klein and Scherk-Schwarz reductions, their asymptotic AdS spaces in general do not. The resulting lower dimensional objects are black holes with runaway asymptotics in supergravity theories with no maximally symmetric vacua. Such classes of solutions are already known to exist in literature, and results here suggest an interpretation in terms of their higher-dimensional origin that often has a full string theory embedding. In a particular relevant example, the relation between 5d Benini-Bobev black strings arXiv:1302.4451 and a class of 4d Cacciatori-Klemm black holes arXiv:0911.4926 is worked out in full detail, providing a type IIB and dual field theory description of the latter solutions. As a consistency check, the Cardy formula for the field theory is shown to match the Bekenstein-Hawking entropy for horizon topology of any genus.