Thermal Properties of a Hot Pion Gas beyond the Quasiparticle Approximation
Abstract
Within the Matsubara formalism we derive expressions for the pion self-energy and the two-pion propagator in a hot pion gas. These quantities are used to selfconsistently calculate the in-medium ππ amplitude beyond the quasiparticle approximation (QPA). The results are shown to differ significantly from QPA-based calculations. We also examine the impact of chiral constraints on the ππ interaction in a chirally improved version of the J\"ulich ππ model.
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