## Abstract

We calculate the equation of state of nuclear matter for arbitrary isospin-asymmetry up to three loop order in the free energy density in the framework of in-medium chiral perturbation theory. In our approach 1π- and 2π-exchange dynamics with the inclusion of the Δ-isobar excitation as an explicit degree of freedom, corresponding to the long- and intermediate-range correlations, are treated explicitly. Few contact terms fixed to reproduce selected known properties of nuclear matter encode the short-distance physics. Two-body as well as three-body forces are systematically included. We find a critical temperature of about 15 MeV for symmetric nuclear matter. We investigate the dependence of the liquidgas first-order phase transition on isospin-asymmetry. In the same chiral framework we calculate the chiral condensate of isospin-symmetric nuclear matter at finite temperatures. The contribution of the Δ-isobar excitation is essential for stabilizing the condensate. As a result, we find no indication of a chiral phase transition for densities ρ≲2ρ ^{0} and at temperatures T≲100 MeV.

Original language | English |
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Pages (from-to) | 317-321 |

Number of pages | 5 |

Journal | Progress in Particle and Nuclear Physics |

Volume | 67 |

Issue number | 2 |

DOIs | |

State | Published - Apr 2012 |

## Keywords

- Chiral condensate
- Chiral perturbation theory
- Equation of state
- Liquidgas phase transition
- Nuclear matter