2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45494I review results on the shift of the $ρ$ meson mass at nonzero temperature in a gauged linear sigma model, under the assumption of strict vector meson dominance. (Based upon a talk presented at the International Workshop on "Chiral Dynamics in Hadrons and Nuclei", Seoul, Korea, Feb., 1995).14 pages, LaTeXHigh Energy Physics - Phenomenologytext