Nonequilibrium chiral perturbation theory and disoriented chiral condensates

Details Nonequilibrium chiral perturbation theory and disoriented chiral condensates Nonequilibrium chiral perturbation theory and disoriented chiral condensates

1999-10-28

arxiv.org/abs/hep-ph/9910533v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given in ``Hadron Physics: Effective Theories of Low Energy QCD'', Coimbra, Portugal, Sept. 10-15 1999. Uses aipproc.sty,

Scientific paper

We analyse the extension of Chiral Perturbation Theory to describe a meson gas out of thermal equilibrium. For that purpose, we 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.

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