Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 23: Struktur und Dynamik von Kernen V

HK 23.2: Talk

Tuesday, March 22, 2011, 17:00–17:15, O-1

Thermodynamics of the chiral condensate — •Salvatore Fiorilla, Wolfram Weise, and Norbert Kaiser — Physik-Department, TU München, D-85747 Garching

In-medium chiral perturbation theory at finite temperature is used to calculate the quark condensate as a function of the baryon density and of the temperature. Contributions beyond the linear density approximation are given in terms of the derivative of the interaction part of the free energy density with respect to the pion mass. The pion mass dependence results from chiral one- and two-pion exchange processes in the medium, with inclusion of Δ-isobar excitations and Pauli-blocking effects on nucleons in intermediate states. The calculation is performed to three-loop order and includes chiral three-body forces. It turns out that correlation effects stabilize the chiral condensate in nuclear matter. As a consequence, there is no tendency toward a chiral first order phase transition at baryon densities below twice the density of normal nuclear matter and at temperatures T ≲ 100 MeV.

Work supported in part by BMBF, GSI and the DFG Cluster of Excellence “Origin and Structure of the Universe”.