Inner Cauchy horizon of axisymmetric and stationary black holes with surrounding matter in Einstein-Maxwell theory

Abstract

We study the interior electrovacuum region of axisymmetric and stationary black holes with surrounding matter and find that there exists always a regular inner Cauchy horizon inside the black hole, provided the angular momentum $J$ and charge $Q$ of the black hole do not vanish simultaneously. In particular, we derive an explicit relation for the metric on the Cauchy horizon in terms of that on the event horizon. Moreover, our analysis reveals the remarkable universal relation $(8\pi J{)}^2+(4\pi Q^2{)}^2=A^{+}{A}^{-}$, where $A^{+}$ and $A^{-}$ denote the areas of event and Cauchy horizon respectively.

arXiv comment4 pages, 1 figure

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• General relativistic gravitational field of a rigidly rotating disk of dust: Solution in terms of ultraelliptic functions
• Progress in relativistic gravitational theory using the inverse scattering method
• The inner Cauchy horizon of axisymmetric and stationary black holes with surrounding matter

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