Collapse of spherical charged anisotropic fluid spacetimes

TL;DR

This paper derives new exact solutions for the gravitational collapse of charged, anisotropic spherical fluids, showing conditions under which singularities can be avoided, extending previous dust collapse models.

Contribution

It introduces a class of charged, anisotropic collapse solutions that generalize known dust models and demonstrates singularity avoidance mechanisms.

Findings

Shell focusing singularities can be avoided under certain conditions.

Charged anisotropic solutions include known dust models as special cases.

Regular solutions with shell crossing effects are possible.

Abstract

A class of spherical collapsing exact solutions with electromagnetic charge is derived. This class of solutions -- in general anisotropic -- contains however as a particular case the charged dust model already known in literature. Under some regularity assumptions that in the uncharged case give rise to naked singularities, it is shown that the process of shell focusing singularities avoidance -- already known for the dust collapse -- also takes place here, determing shell crossing effects or a completely regular solution.