Superradiance and Instability of Black Holes

TL;DR

This paper explores how superradiance can lead to instabilities in higher-dimensional rotating black holes, linking scalar field superradiant instability to gravitational instability for tensor perturbations.

Contribution

It establishes a connection between superradiant instability of scalar fields and gravitational instability in higher-dimensional Kerr-AdS black holes.

Findings

Superradiant instability of scalar fields implies gravitational instability for tensor perturbations.

The study extends understanding of black hole stability in higher dimensions.

Highlights the role of superradiance in black hole dynamics.

Abstract

We discuss the relation between the superradiance phenomenon and the instability of rotating black holes in higher dimensions. In particular, we point out that the superradiant instability of a massless scalar field around a simply rotating Kerr-adS black hole implies the gravitational instability of that black hole for tensor-type perturbations.