Behaviour of Scalar Perturbations of a Reissner-Nordstrom Black Hole Inside the Event Horizon

Physics

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Scientific paper

This paper considers general scalar perturbations of a Reissner-Nordstrom black hole and examines the qualitative behaviour of these perturbations in the region between and on the inner and outer horizons r- <= r<= r+. Initial data are specified in terms of the ingoing radiation crossing the outer (event) horizon. The only essential restriction on these data is that the radiation should not die away too slowly on this horizon. The resultant perturbations are shown to be bounded and continuous. It is also shown that if tilde{u} is any retarded null coordinate such that tilde{u} = 0 on the event horizon, then the perturbations tend to zero along lines of constant radius as tilde{u} downarrow 0. In particular, all these properties hold for perturbations on the inner horizon. For certain types of scalar field (including the zero rest mass scalar field) perturbations vanish at the crossover point on the inner horizon.

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