2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/180286This talk aims at questioning the vanishing of Unruh temperature for an inertial observer in Minkovski spacetime with finite lifetime, arguing that in the non eternal case the existence of a causal horizon is not linked to the non-vanishing of the acceleration. This is illustrated by a previous result, the diamonds temperature, that adapts the algebraic approach of Unruh effect to the finite case.Proceedings of the conference DICE 2006, Piombino september 2006General Relativity and Quantum CosmologyHigh Energy Physics - Theorytext