MODELING THE BLACK-HOLE INTERIOR

We present two possibilities for the internal structure of a charged black hole in which we take into account the hypothesis that the curvature is bounded. In the first model we match the de Sitter spacetime with the external Reisner-Nordstrom solution at a null junction surface that represents a short transition layer placed at the Cauchy horizon. In the second model, we describe the black hole evaporation using a pair of non-stationary null shells.