Münster 2017 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 23: Nuclear Astrophysics II
HK 23.1: Gruppenbericht
Dienstag, 28. März 2017, 14:00–14:30, F 33
Chiral nuclear equation of state for neutron-star and supernova simulations — •Corbinian Wellenhofer1, Jeremy W. Holt2, Nobert Kaiser1, and Wolfram Weise1 — 1Technische Universität München — 2Texas A-M University
Chiral effective field theory (χEFT) provides the basis for the description of the nuclear interaction in terms of a systematic low-energy expansion. In this talk, we review recent research efforts headed towards the construction of a χEFT-based nuclear equation of state (EoS) to be used in astrophysical simulations of core-collapse supernovæ and binary neutron-star mergers. The finite-temperature EoS of isospin-asymmetric nuclear matter has been computed using chiral low-momentum two- and three-nucleon interactions in many-body perturbation theory (MBPT), and the results have been benchmarked against available empirical constraints and thermodynamic consistency. At low temperatures, MBPT gives rise to a nonanalytic form of the dependence of the EoS on the isospin asymmetry. The implications of this regarding explicit parametrizations of the isospin-asymmetry dependence are investigated, and we discuss initial results concerning the construction of global EoS tables for astrophysical applications.