Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 25: Nukleare Astrophysik II

HK 25.3: Talk

Tuesday, March 22, 2011, 17:15–17:30, HS3

Nuclear matter equation of state below saturation density in a relativistic mean-field model with new constraints on the couplings — •Maria Voskresenskaya¹ and Stefan Typel^1,2 — ¹GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt — ²Excellence Cluster Universe, TU München, Garching

The description of neutron star matter requires the knowledge of the equation of state (EoS) in a wide range of densities. In this work we are trying to improve the phenomenological description of nuclear matter within a generalized relativistic mean field (RMF) model with density dependent coupling constants. The couplings are well constrained only near the saturation density of nuclear matter and are extrapolated to smaller and higher densities. A comparison of the RMF equation of state of nuclear matter with the virial expansion leads to new constraints for the couplings at small densities. A new parametrization of density dependent couplings is suggested based on these constraints and various effects are discussed that are important for the thermodynamical properties of matter below saturation.