2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/201073We describe the quasi-static collapse of a radiating, spherical shell of matter in de Sitter space-time using a thermodynamical formalism. It is found that the specific heat at constant area and other thermodynamical quantities exhibit singularities related to phase transitions during the collapse.9 pages, 2 figures, accepted for publication in Phys. Lett. BGeneral Relativity and Quantum Cosmologytext