Tables of hyperonic matter equation of state for core-collapse supernovae

Chikako Ishizuka*, Akira Ohnishi, Kohsuke Tsubakihara, Kohsuke Sumiyoshi, Shoichi Yamada

*この研究の対応する著者

研究成果: Article査読

119 被引用数 (Scopus)

抄録

We present sets of equation of state (EOS) of nuclear matter including hyperons using an SUf(3) extended relativistic mean field (RMF) model with a wide coverage of density, temperature and charge fraction for numerical simulations of core-collapse supernovae. Coupling constants of Σ and Ξ hyperons with the σ meson are determined to fit the hyperon potential depths in nuclear matter, UΣ0) ≃ +30 MeV and UΞ0) ≃ -15 MeV, which are suggested from recent analyses of hyperon production reactions. At low densities, the EOS of uniform matter is connected with the EOS by Shen et al, in which the formation of finite nuclei is included in the Thomas-Fermi approximation. In the present EOS, the maximum mass of neutron stars decreases from 2.17 M (Neμ) to 1.63 M (NYeμ) when hyperons are included. In a spherical, adiabatic collapse of a 15 M star by the hydrodynamics without neutrino transfer, hyperon effects are found to be small, since the temperature and density do not reach the region of hyperon mixture, where the hyperon fraction is above 1 % (T > 40 MeV or ρB > 0.4 fm-3).

本文言語English
論文番号085201
ジャーナルJournal of Physics G: Nuclear and Particle Physics
35
8
DOI
出版ステータスPublished - 2008 8 1

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学

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