Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 79: Nukleare Astrophysik

HK 79.5: Talk

Thursday, March 7, 2013, 18:15–18:30, HSZ-403

Low- and high-density nuclear equation of state and the hyperon puzzle — •Giuseppe Colucci and Armen Sedrakian — Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, D-60438 Frankfurt, Germany

The measurements of the unusually high mass of the millisecond pulsar PSR J1614-2230 (1.97 ± 0.04 M_⊙) imposes a strong constraint on the nuclear Equation of State (EoS), in particular for what concerns the finite density behaviour of nuclear and neutron matter. In my talk I will first discuss a model for the low-density part of the EoS, based on chiral one-pion exchange. I consider a self-consistent approach at finite temperature and density and show that even in a fully-relativistic theory the one-pion exchange contribution is dominated by a contact interaction. Then, a relativistic mean-field approach will be used to discuss the high-density part of the EoS, including the presence of hyperons. In the latter, a density dependent parametrization is used and a parameter study on the hyperon-scalar meson coupling is performed.
Supported by the Hessian LOEWE initiative through the Helmholtz International Center for FAIR (HIC for FAIR).