Forming Nonsingular Black Holes from Dust Collapse

TL;DR

This paper presents an analytical model of dust collapse within string-inspired gravity, resulting in nonsingular black holes with bouncing matter instead of singularities, and explores their internal structure and potential matter expulsion.

Contribution

It provides a complete analytical solution for dust collapse in string-based gravity, showing how nonsingular black holes with bouncing matter can form and their internal structure.

Findings

Black holes can form without singularities due to bouncing matter.

The internal structure resembles Reissner-Nordstrom black holes but avoids singularities.

Bouncing matter may be expelled through nonlinear resonance mechanisms.

Abstract

The dynamics of the gravitational collapse is examined in the realm of string based formalism of D-branes that encompass General Relativity as a low energy limit. A complete analytical solution is given to the spherically symmetric collapse of a pure dust star, including its matching with a corrected Schwarzschild exterior spacetime. The collapse forms a black hole (an exterior event horizon) enclosing not a singularity but perpetually bouncing matter in the infinite chain of spacetime maximal analytical extensions inside the outer event horizon. This chain of analytical extensions has a structure analogous to that of the Reissner-Nordstrom solution, except that the timelike singularities are avoided by bouncing barriers. The interior trapped bouncing matter has the possibility of being expelled by disruptive nonlinear resonance mechanisms.