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

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 ≤ 2.25M⊙ 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.

Note:

6 pages, 4 figures, Proceedings of International Conference on "The Modern Physics of Compact Stars and Relativistic Gravity", 18-21 September 2013, Yerevan, Armenia

equation of state
hypernucleus
finite temperature
coupling: density dependence
parametrization
neutrino
effective Lagrangian: relativistic
density: high
numerical calculations
symmetry: SU(6)

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