Gómez Nicola, Ángel2023-06-202023-06-201999-03-111-56396-927-010.1063/1.1303025https://hdl.handle.net/20.500.14352/60927© Amer Inst Physics. I wish to thank the organisers of the “Hadron Physics” conference and the Theory group in Coimbra for their kind help and hospitality. Financial support from CICYT, Spain, project AEN97-1693, is also acknowledged.We analyse the extension of Chiral Perturbation Theory to describe a meson gas out of thermal equilibrium. For that purpose, se let the pion decay constant be a time-dependent function and work within the Schwinger-Keldysh contour technique. A useful connection with curved space-time QFT allows to consistently renormalise the model, introducing two new low-energy constants in the chiral limit. We discuss the applicability of our approach within a Relativistic Heavy-Ion Collision environment. In particular, we investigate the formation of Disoriented Chiral Condensate domains in this model, via the parametric resonance mechanism.engbook parthttp://dx.doi.org/10.1063/1.1303025http://scitation.aip.orghttp://arxiv.org/abs/hep-ph/9910533open access51-73Phase-transitionHigh-energyFinite-temperatureCollisionsEvolutionMassFísica-Modelos matemáticosFísica matemática