2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/33561The thermodynamics is extented to spacetimes with spin-torsion density.Impplications to Einstein-Cartan-de Sitter inflationary phases are discussed.A relation between the spin-torsion density,entropy and temperature is presented.A lower limit for the radius of the Universe may be obtained from the spin-torsion density and the Planck lenght.Latex fileGeneral Relativity and Quantum Cosmologytext