Binding Energies of Hyperonic Matter and Applications to Neutron Stars

Abstract

The conserving nonlinear, nonchiral σ‐ω‐ρ hadronic mean‐field approximation is applied to saturation properties of nuclear and hyperonic matter, properties of hadron and hadron‐quark neutron stars. Nonlinear interactions are renormalized self‐consistently as effective coupling constants, effective masses, and sources of equations of motion by maintaining thermodynamic consistency to the mean‐field approximation. The effective masses and coupling constants become density‐dependent, and they simultaneously determine binding energies and saturation properties of nuclear matter and hyperonic matter. The conserving nonlinear σ‐ω‐ρ mean‐field approximation with vacuum fluctuation corrections and strange quark matter defined by the MIT‐bag model were employed to examine properties of hadron‐(strange) quark stars. We found that hadron‐quark stars become more stable at high densities compared to pure hadronic and strange quark stars.