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Linearized Stability of Extreme Black Holes · Around

2017

Linearized Stability of Extreme Black Holes

Burko, Lior M., Khanna, Gaurav

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Extreme black holes have been argued to be unstable, in the sense that under linearized gravitational perturbations of the extreme Kerr spacetime the Weyl scalar $\psi_4$ blows up along their event horizons at very late advanced times.

We show numerically, by solving the Teukolsky equation in 2+1D, that all algebraically-independent curvature scalar polynomials approach limits that exist when advanced time along the event horizon approaches infinity.
Therefore, the horizons of extreme black holes are stable against linearized gravitational perturbations.
We argue that the divergence of $\psi_4$ is a consequence of the choice of a fixed tetrad, and that in a suitable dynamical tetrad all Weyl scalars, including $\psi_4$, approach their background extreme Kerr values.

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