Stability of white holes revisited

TL;DR

This paper demonstrates that white hole models interacting with matter can achieve stability through negative central mass, with the negative mass singularity hidden behind a positive mass coat, supporting a relaxed cosmic censorship.

Contribution

It introduces stable white hole models with negative central mass and shows how they can be consistent with cosmic censorship principles.

Findings

White hole models can be stabilized with negative central mass.

Naked singularities are hidden under positive mass layers, ensuring strong redshift.

Results apply to models with null shells, matter flows, and photon gases.

Abstract

It is shown that the models of white hole interacting with external matter can be made stable by introduction of a negative central mass. Similar results are obtained for the models of white hole, interacting with null shells, with radial flows of matter and with photon gas. In realistic models, a naked timelike singularity corresponding to the negative mass is hidden under a coat of positive mass, providing an extremely strong redshift for photons born in the Planck neighborhood of the singularity and observed at infinity, thereby realizing the principle of cosmic censorship in a relaxed form.