Quasi-Normal Modes in Topologically Massive Gravity

Abstract

We determine the black hole quasi-normal mode spectrum for tensor perturbations in topologically massive AdS-gravity. In the special case of chiral gravity quasi-normal modes are absent despite of the presence of a horizon. In the process we uncover a simple algebraic structure in the quasi normal modes spectrum: the tower of QNM_s14s consists of descendents of a _s15chiral highest weight_s14_s14 QNM which in turn satisfies a first order equation.