Answers are grounded in this paper and cite their sources.
We study the effect of transport processes (diffusion and free streaming) on a collapsing spherically symmetric distribution of matter in a self-similar space-time. A very simple solution shows interesting features when it is matched with the Vaidya exterior solution. In the mixed case (diffusion and free streaming), we find a barotropic equation of state in the stationary regime. In the diffusion approximation the gravitational potential at the surface is always constant; if we perturb the stationary state, the system is very stable, recovering the barotropic equation of state as time progresses. In the free-streaming case the self-similar evolution is stationary, but with a nonbarotropic equation of state.
No takes yet. Share an insight, caveat, or question.
Barreto et al. (1998) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: