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Cauchy Horizon

While black holes are surrounded by an event horizon which acts as a one-way membrane separating the region of space-time surrounding the gravitational singularity, physicists are able to predict the initial conditions through the interior of a rotating black hole past the event horizon and up to an interior boundary beyond which the laws of physics break down completely.

This interior boundary is the Cauchy horizon, a light-like boundary separating time-like geodesics on one side and space-like geodesics on the other, and is generally considered to be the boundary of the singularity itself.

Web Resources On Cauchy Horizon

Black Hole Interior
Cauchy horizon (Wikipedia)

Book Resources On Cauchy Horizon

The Einstein Equations and the Large Scale Behavior of Gravitational Fields: 50 Years of the Cauchy Problem in General Relativity by Piotr Chrusciel and Helmut Fredrich, Eds.
Time Travel in Einstein's Universe: The Physical Possibilities of Travel Through Time by J. Richard Gott
Geometric Algebra for Physicists by Chris Doran and Anthony Lasenby

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