### Black hole instabilities and local Penrose inequalities

Reall, H *(University of Cambridge)*

Friday 01 June 2012, 12:15-13:00

Satellite

#### Abstract

Various higher-dimensional black holes have been shown to be unstable by studying linearized gravitational perturbations. This is often very complicated. I shall describe a simpler method for demonstrating instability. The idea is to construct initial data describing a small perturbation of the black hole and which violates an inequality analogous to the 4d Penrose inequality. I will describe recent work applying the method to non-uniform black strings.

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