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HK: Fachverband Physik der Hadronen und Kerne

HK 62: Nuclear Astrophysics 5

HK 62.4: Vortrag

Donnerstag, 26. März 2015, 18:00–18:15, P/H1

Neutron star equations of state with optical potential constraint — •Sofija Antic^{1, 2} and Stefan Typel¹ — ¹GSI, Darmstadt, Germany — ²TU Darmstadt, Germany

Nuclear matter and compact neutron stars are studied in the framework of an extended relativistic mean-field (RMF) model that includes higher-order derivative and density dependent couplings of nucleons to the meson fields. Generalized Euler-Lagrange equations follow from the principle of least action and the most general expresions for current and energy-momentum tensor are derived. The equation of state (EoS) of infinite nuclear matter is obtained for different non-linear derivative coupling functions. From experimental constraints on the optical potential the appropriate energy dependence of the regulator functions is chosen. The thermodynamical consistency of the model is demonstrated.

Spherical, non-rotating stars are described with the new EoS considering charge neutrality and β-equilibrium conditions. The stellar structure is calculated by solving the Tolman-Oppenheimer-Volkov (TOV) equations and the results for neutron stars are shown in terms of mass-radius relations.

This work is supported by the Helmholtz Association (HGF) through the Nuclear Astrophysics Virtual Institute (NAVI, VH-VI-417).