STRUCTURE OF THE BLACK-HOLES CAUCHY-HORIZON SINGULARITY

We study the Cauchy-horizon (CH) singularity of aspherical charged bla ck hole perturbed nonlinearly by a self-gravitating massless scalar fi eld. We show numerically that the singularity is weak both at the earl y and al the late sections of the CH, where the focusing of the area c oordinate r is strong. In the early section the metric is almost Reiss ner-Nordstrom, and the fields behave according to perturbation analysi s. We find exact analytical expressions for the gradients of r and of the scalar field, which are valid at both sections. We then verify the se analytical results numerically.