2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36586We study a new spacetime which is shown to be the general geometrical background for Thermal Field Theories at equilibrium. The different formalisms of Thermal Field Theory are unified in a simple way in this spacetime. The set of time-paths used in the Path Ordered Method is interpreted in geometrical terms.RevTeX, 11 pages, 2 figuresGeneral Relativity and Quantum CosmologyHigh Energy Physics - Theorytext