Equation of state of hypernuclear matter: Tuning hyperon-scalar-meson couplings

Abstract

We discuss to which extent the modifications of the hyperon-scalar-meson coupling constants affect the equation of state (EoS) hypernuclear matter. The study is carried out within a relativistic density functional theory. The nucleonic matter is described in terms of a density-dependent parametrization of nucleon-meson couplings, whereas the hyperon-meson couplings are deduced from the octet model. We identify the parameter space of hyperon-meson couplings for which massive stellar configurations with M ≤ 2.25Mȯ exist. We also discuss the EoS at finite temperatures with and without of a trapped neutrino component and show that neutrinos stiffen the EoS and change qualitatively the composition of stellar matter. © Published under licence by IOP Publishing Ltd.