2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/215987Assuming that dark energy may be treated as a fluid with a well defined temperature, close to equilibrium, we argue that if nowadays there is a transfer of energy between dark energy and dark matter, it must be such that the latter gains energy from the former and not the other way around.6 pages, revtex file, no figures; version accepted for publication in General Relativity and GravitationGeneral Relativity and Quantum CosmologyAstrophysicsHigh Energy Physics - Phenomenologytext