Supersymmetric AdS_4 black holes and attractors

TL;DR

This paper constructs the first explicit supersymmetric AdS_4 black hole solutions with nonconstant scalars, analyzing their attractor flow, near-horizon geometry, and the moduli space, confirming the charge-dependent entropy consistent with the attractor mechanism.

Contribution

It provides the first explicit examples of supersymmetric AdS_4 black holes with nonconstant scalars and explores their attractor behavior and moduli space structure.

Findings

Black hole entropy depends only on charges.

Presence of flat directions in the black hole potential.

Explicit moduli space for one prepotential case.

Abstract

Using the general recipe given in arXiv:0804.0009, where all timelike supersymmetric solutions of N=2, D=4 gauged supergravity coupled to abelian vector multiplets were classified, we construct the first examples of genuine supersymmetric black holes in AdS_4 with nonconstant scalar fields. This is done for various choices of the prepotential, amongst others for the STU model. These solutions permit to study the BPS attractor flow in AdS. We also determine the most general supersymmetric static near-horizon geometry and obtain the attractor equations in gauged supergravity. As a general feature we find the presence of flat directions in the black hole potential, i.e., generically the values of the moduli on the horizon are not completely specified by the charges. For one of the considered prepotentials, the resulting moduli space is determined explicitely. Still, in all cases, we find that the black hole entropy depends only on the charges, in agreement with the attractor mechanism.