Multi-charge accelerating black holes and spinning spindles

TL;DR

This paper constructs supersymmetric AdS$_2$ solutions with spindle geometries as near horizon limits of extremal rotating and accelerating black holes in AdS$_4$, connecting supergravity solutions to microstate counting of M2-branes.

Contribution

It introduces a new family of multi-charge, rotating, and accelerating supersymmetric black hole solutions in AdS$_4$ and their near horizon spindle geometries, extending the understanding of black hole microstates.

Findings

Constructed multi-charge supersymmetric AdS$_2$ solutions with spindle geometries.

Connected near horizon solutions to extremal rotating and accelerating black holes.

Computed black hole entropy via an extremized entropy function.

Abstract

We construct a family of multi-dyonically charged and rotating supersymmetric AdS$_2\times \Sigma$ solutions of $D=4$, $\mathcal{N}=4$ gauged supergravity, where $\Sigma$ is a sphere with two conical singularities known as a spindle. We argue that these arise as near horizon limits of extremal dyonically charged rotating and accelerating supersymmetric black holes in AdS$_4$, that we conjecture to exist. We demonstrate this in the non-rotating limit, constructing the accelerating black hole solutions and showing that the non-spinning spindle solutions arise as the near horizon limit of the supersymmetric and extremal sub-class of these black holes. From the near horizon solutions we compute the Bekenstein-Hawking entropy of the black holes as a function of the conserved charges, and show that this may equivalently be obtained by extremizing a simple entropy function. For appropriately quantized magnetic fluxes, the solutions uplift on $S^7$, or its ${\cal N}=4$ orbifolds $S^7/\Gamma$, to smooth supersymmetric solutions to $D=11$ supergravity, where the entropy is expected to count microstates of the theory on $N$ M2-branes wrapped on a spinning spindle, in the large $N$ limit.