Lectures on Linear Stability of Rotating Black Holes
Abstract
These lecture notes are concerned with linear stability of the nonextreme Kerr geometry under perturbations of general spin. After a brief review of the Kerr black hole and its symmetries, we describe these symmetries by Killing fields and work out the connection to conservation laws. The Penrose process and superradiance effects are discussed. Decay results on the longtime behavior of Dirac waves are outlined. It is explained schematically how the Maxwell equations and the equations for linearized gravitational waves can be decoupled to obtain the Teukolsky equation. It is shown how the Teukolsky equation can be fully separated to a system of coupled ordinary differential equations. Linear stability of the nonextreme Kerr black hole is stated as a pointwise decay result for solutions of the Cauchy problem for the Teukolsky equation. The stability proof is outlined, with an emphasis on the underlying ideas and methods.
 Publication:

Einstein Equations: Physical and Mathematical Aspects of General Relativity
 Pub Date:
 November 2019
 DOI:
 10.1007/9783030180614_2
 arXiv:
 arXiv:1811.08204
 Bibcode:
 2019eepm.book...61F
 Keywords:

 General Relativity and Quantum Cosmology;
 Mathematical Physics
 EPrint:
 25 pages, LaTeX, 3 figures, lectures given at first DOMOSCHOOL in July 2018, minor improvements (published version)