1305.3475 (Morgan Le Delliou et al.)

Separating expansion and collapse in general fluid models with heat flux    [PDF]

Morgan Le Delliou, José Pedro Mimoso, Filipe C. Mena, Michele Fontanini, Daniel C. Guariento, Elcio Abdalla

In this letter we consider spherically symmetric general fluids with heat flux and give the appropriate set of conditions that define the divide between expansion and collapse in the cases in which heat flux and its evolution vanish at the separating surface. We extend previous works with a fully non-linear analysis in the $3 + 1$ splitting, and present gauge-invariant results. The definition of the separating surface is inspired by the conservation of the Misner-Sharp mass, and is obtained by generalizing the Tolman-Oppenheimer-Volkoff equilibrium and turnaround conditions. We emphasize the non-local character of these conditions as found in previous works and discuss connections to the phenomena of spacetime cracking and thermal peeling.

View original: http://arxiv.org/abs/1305.3475