2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/196869It is shown that the effective inertial mass density of a dissipative fluid just after leaving the equilibrium, on a time scale of the order of relaxation time, reduces by a factor which depends on dissipative variables. Prospective applications of this result to cosmological and astrophysical scenarios are discussed.10 pages Latex, to appear in Phys. Lett. AGeneral Relativity and Quantum CosmologyAstrophysicsCondensed MatterMathematical Physicstext