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In this paper we consider spherically symmetric general fluids with heatflux, motivated by causal thermodynamics, and give the appropriate set ofconditions that define separating shells defining the divide between expansionand collapse. To do so we add the new requirement that heat flux and itsevolution vanish at the separating surface. We extend previous works with afully nonlinear analysis in the 1+3 splitting, and present gauge-invariantresults. The definition of the separating surface is inspired by theconservation of the Misner-Sharp mass, and is obtained by generalizing theTolman-Oppenheimer-Volkoff equilibrium and turnaround conditions. We emphasizethe nonlocal character of these conditions as found in previous works anddiscuss connections to the phenomena of spacetime cracking and thermal peeling.

Separating expansion and collapse in general fluid models with heat flux