Kaon condensation in hyperonic matter and equation of state

ハイペロン物質でのK中間子凝縮と状態方程式

武藤 巧*; 丸山 敏毅  ; 巽 敏隆*

Muto, Takumi*; Maruyama, Toshiki; Tatsumi, Toshitaka*

Kaon condensation in hyperon-mixed matter, which may be realized in neutron stars, is investigated on the basis of the relativistic mean-field theory for baryon-baryon interaction, combined with the effective chiral Lagrangian. We introduce the range terms for both nucleons and hyperons and a pole contribution from the (1405) so as to reproduce the -wave on-shell scattering lengths. Onset density of kaon condensation in the hyperon-mixed matter and the equation of state (EOS) is obtained. It is shown that coexistence of kaon condensation and hyperon-mixed matter necessarily leads to significant softening of the EOS. We address stiffening effects to make the EOS consistent with recent observations of massive neutron stars.