Black Rings in U(1)^3 Supergravity and their dual 2d CFT

TL;DR

This paper investigates the near-horizon geometries of extremal black rings in five-dimensional supergravity, revealing AdS3 throats and proposing a dual 2D CFT description, connecting with the Kerr/CFT correspondence.

Contribution

It demonstrates the emergence of AdS3 geometries in EVH limits of black rings and proposes a dual CFT, extending the understanding of black hole microstates and holography.

Findings

Near-horizon geometries develop AdS3 throats in EVH limit

The AdS3 factor becomes a BTZ black hole at near-EVH limit

A dual 2D CFT is proposed for the low-energy dynamics

Abstract

We study the near horizon geometry of black ring solutions in five-dimensional U(1)^3 supergravity with three electric dipole charges and one angular momentum. We consider the extremal vanishing horizon (EVH) limit of these solutions and show that the near horizon geometries develop locally AdS_3 throats which at the near-EVH near horizon limit the AdS_3 factor turns to a BTZ black hole. By analysing the first law of thermodynamics for black rings we show that at EVH limit it reduces to the first law of thermodynamics for BTZ black holes. Using the AdS3/CFT2 duality, we propose a dual CFT to describe the near-horizon low energy dynamics of near-EVH black rings. We also discuss the connection between our CFT proposal and the Kerr/CFT correspondence in the cases where these two overlap.