Dense matter equation of state of a massive neutron star with anti-kaon condensation

Abstract

Recent measurements of neutron star mass from several candidates (PSR J$1614-2230$, PSR J$0348+0432$, MSP J$0740+6620$) set the lower bound on the maximum possible mass for this class of compact objects $\sim 2$ M${}_{\odot }$. Existence of stars with high mass brings the possibility of existence of exotic matter (hyperons, meson condensates) at the core region of the objects. In this work, we investigate the (anti)kaon ($K^{-},{\bar{K}}^0$) condensation in $\beta -$equilibrated nuclear matter within the framework of covariant density functional theory. The functionals in the kaonic sector are constrained by the experimental studies on $K^{-}$ atomic, kaon-nucleon scattering data fits. We find that the equation of state softens with the inclusion of (anti)kaon condensates, which lowers the maximum mass of neutron star. In one of the density-independent coupling cases, the $K^{-}$ condensation is through a first-order phase transition type, which produces a $2$ M${}_{\odot }$ neutron star. The first-order phase transition results in mixed phase region in the inner core of the stars. While ${\bar{K}}^0$ condensation appears via second-order phase transition for all the models we consider here.

14 pages, 13 figures, corrected some typos, matches with the published version

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Cited by in corpus (7)

• Progress in Constraining Nuclear Symmetry Energy Using Neutron Star Observables Since GW170817
• Massive $\Delta$-resonance admixed hypernuclear stars with anti-kaon condensations
• Kaon meson condensate in neutron star matter including hyperons
• Hybrid stars are compatible with recent astrophysical observations
• Non-radial oscillations in newly born compact star considering effects of phase transition
• Influence of the nuclear symmetry energy slope on observables of compact stars with $\Delta$-admixed hypernuclear matter
• Binary neutron star mergers within kaon condensation: GW170817