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On the global stability of the wave-map equation in Kerr spaces with small angular momentum

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arxiv 1412.5679 v1 pith:QLDPMZ64 submitted 2014-12-17 math.AP gr-qc

classification math.APgr-qc
keywords axiallykerrperturbationssolutionstabilitysymmetricproblemsmall
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abstract

This paper is motivated by the problem of the nonlinear stability of the Kerr solution for axially symmetric perturbations. We consider a model problem concerning the axially symmetric perturbations of a wave map $\Phi$ defined from a fixed Kerr solution $\KK(M,a)$, $0\le a < M $, with values in the two dimensional hyperbolic space $\HHH^2$. A particular such wave map is given by the complex Ernst potential associated to the axial Killing vectorfield $\Z$ of $\KK(M,a)$. We conjecture that this stationary solution is stable, under small axially symmetric perturbations, in the domain of outer communication (DOC) of $\KK(M,a)$, for all $0\le a<M$ and we provide preliminary support for its validity, by deriving convincing stability estimates for the linearized system.

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  1. On Axially Symmetric Perturbations of Kerr Black Hole Spacetimes

    gr-qc 2025-07 conditional novelty 4.0 of 10

    For subextremal Kerr spacetimes, the paper constructs a positive-definite, conserved Hamiltonian energy for axially symmetric linear perturbations, indicating a form of linear stability within this symmetry class.

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