Stability of white holes revisited

Understand

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.