A proof of the uniform boundedness of solutions to the wave equation on slowly rotating Kerr backgrounds


Type
Article
Change log
Authors
Dafermos, Mihalis 
Rodnianski, Igor 
Abstract

We consider Kerr spacetimes with parameters a and M such that |a|<< M, Kerr-Newman spacetimes with parameters |Q|<< M, |a|<< M, and more generally, stationary axisymmetric black hole exterior spacetimes which are sufficiently close to a Schwarzschild metric with parameter M>0, with appropriate geometric assumptions on the plane spanned by the Killing fields. We show uniform boundedness on the exterior for sufficiently regular solutions to the scalar homogeneous wave equation. In particular, the bound holds up to and including the event horizon. No unphysical restrictions are imposed on the behaviour of the solution near the bifurcation surface of the event horizon. The pointwise estimate derives in fact from the uniform boundedness of a positive definite energy flux. Note that in view of the very general assumptions, the separability properties of the wave equation on the Kerr background are not used.

Description
Keywords
gr-qc, gr-qc, math.AP, math.DG
Journal Title
Inventiones Mathematicae
Conference Name
Journal ISSN
0020-9910
1432-1297
Volume Title
185
Publisher
Springer Nature
Sponsorship
European Research Council (208007)