Thermodynamics of the in-medium chiral condensate

Details Thermodynamics of the in-medium chiral condensate Thermodynamics of the in-medium chiral condensate

2011-04-14

arxiv.org/abs/1104.2819v1

Physics

Nuclear Physics

Nuclear Theory

4 pages, 3 figures, submitted to Physical Review Letters

Scientific paper

The temperature dependence of the chiral condensate in isospin-symmetric nuclear matter at varying baryon densities is investigated starting from a realistic free energy density of the correlated nuclear many-body system. The framework is thermal in-medium chiral effective field theory which permits a systematic calculation of the quark mass dependence of the free energy density. One- and two-pion exchange processes, virtual $\Delta(1232)$-isobar excitations and Pauli blocking corrections are treated up to and including three-loop order. It is found that nuclear matter remains in the Nambu-Goldstone phase with spontaneously broken chiral symmetry at least in the range of temperatures $T\lesssim 100\,$MeV and baryon densities up to about twice the density of normal nuclear matter.

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