Coexistence of Kaon Condensation and Hyperons in Hadronic Matter and Its Relevance to Quark Matter

TL;DR

This paper investigates the coexistence of kaon condensation and hyperons in neutron star matter using relativistic mean-field theory, highlighting how this affects the equation of state and its consistency with observations.

Contribution

It demonstrates the plausibility of kaon-condensed phases in hyperon-rich matter and discusses effects that stiffen the EOS to align with neutron star data.

Findings

Kaon condensation can coexist with hyperons in neutron star matter.

The presence of kaon condensation softens the equation of state.

Additional effects are necessary to stiffen the EOS for observational consistency.

Abstract

Coexistence of kaon condensation and hyperons, which may be realized in neutron stars, is investigated on the basis of the relativistic mean-field theory combined with the effective chiral Lagrangian. It is shown that kaon-condensed phase in hyperon-mixed matter is plausible, but it leads to significant softening of the equation of state (EOS).We discuss indispensable effects which make the EOS stiffer so as to be consistent with recent neutron-star observations.