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Kaon condensation in hyperonic matter and equation of state

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 $$Lambda$$(1405) so as to reproduce the $$S$$-wave on-shell $$KN$$ 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.

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