Stability analysis of black holes by the $S$-deformation method for coupled systems

Abstract

We propose a simple method to prove the linear mode stability of a black hole when the perturbed field equations take the form of a system of coupled Schrödinger equations. The linear mode stability of the spacetime is guaranteed by the existence of an appropriate $S$-deformation. Such an $S$-deformation is related to the Riccati transformation of a solution to the Schrödinger system with zero energy. We apply this formalism to some examples and numerically study their stability.

arXiv comment26 pages, 9 figures, v2: minor revisions, v3: minor revisions, to appear in Classical and Quantum Gravity

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