University of Silesia Katowice, POLAND
The systematic study of proto-neutron star matter is done within the nonlinear relativistic mean field approach for different parameterizations. All calculations are performed in the case of nonzero temperature. The characteristic feature of the considered models is the extended isovector sector which comprises a broad spectrum of mixed vector meson interactions. The mixed vector meson interactions are very effective in describing asymmetric nuclear matter as they provide modification of the density dependence of the symmetry energy. The obtained parameterization in the isovector sector, which is related to the strength of the particular vector meson couplings, allows one to study the influence of the remodeled symmetry energy on neutron star properties. This has remarkable consequences in the case when the core of a neutron star includes hyperons as the analysis concerns also the influence of the coupling between isovector meson and the hidden strange vector meson. Such enhancement of the isovecor meson sector links the asymmetry of the model with the strangeness content and modifies the properties and composition of dense matter. The considered models permit different scenarios of proto-neutron star evolution.