Equation-of-state Table with Hyperon and Antikaon for Supernova and Neutron Star Merger

Abstract

We develop a new equation-of-state (EOS) table involving thermal (anti)kaons, Bose–Einstein condensate of K − mesons, and Λ-hyperons for core-collapse supernova and neutron star merger simulations. This EOS table is based on a finite-temperature, density-dependent relativistic hadron field theory where baryon–baryon interaction is mediated by scalar σ , vector ω , and ρ mesons, using the parameter set DD2 for nucleons. The repulsive hyperon–hyperon interaction is mediated by an additional strange ϕ meson. The EOS for the K − condensed matter is also calculated within the framework of the relativistic mean field model, whereas the low-density, inhomogeneous matter is calculated in the extended nuclear statistical equilibrium model. The EOS table is generated for a wide range of values of three parameters—baryon density (10 −12 to ∼1 fm −3 ), positive charge fraction (0.01–0.60), and temperature (0.1–158.48 MeV).