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

2nd International Symposium on the Modern Physics of Compact Stars and Relativistic Gravity

物理学;天文学

Colucci, Giuseppe^1 ; Sedrakian, Armen^1

Institute for Theoretical Physics, J. W. Goethe-University, D-60438 Frankfurt-Main, Germany^1

关键词: Coupling constants;    Density dependent;    Equation of state;    Finite temperatures;    Parameter spaces;    Parametrizations;    Relativistic density functional theory;    Scalar mesons;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/496/1/012003/pdf
DOI  :  10.1088/1742-6596/496/1/012003

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

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 ≤ 2.25Moexist. 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.