Implications of {\sigma}-cut potential on Antikaon condensates in neutron stars

TL;DR

This study explores how a sigma-cut potential influences antikaon condensation in neutron stars, showing it can produce stars heavier than 2 solar masses and aligning with observational data.

Contribution

It introduces a sigma-cut potential into RMF models to analyze its effects on neutron star properties with antikaon condensates, a novel approach in this context.

Findings

Neutron stars heavier than 2 solar masses are possible with antikaon condensates.

The antikaon phase transition is second-order at certain parameter values.

Predicted neutron star properties agree with observational data.

Abstract

We investigate the properties of neutron stars with antikaon condensation in the framework of the Relativistic Mean-Field (RMF) model with a $\sigma$-cut potential. The well-known RMF models, TM1 and TM1e, are used to analyze the structure and composition of neutron stars. The antikaon condensation part of the equation of state (EoS) is constrained from the experimental data of K$^{-}$ atomic and kaon-nucleon scattering. The $\sigma$-cut potential, which is known to make the EoS stiffer at high densities, is modulated by a free parameter $f_{s}$. Our present analysis suggests that one can obtain neutron star configurations heavier than 2$M_{\odot}$ with antikaon condensates in most cases for $f_{s}$ = 0.6. The antikaon phase transition is a second-order for $f_{s}$ = 0.6 for both TM1 and TM1e parameter sets. The calculated global properties of neutron stars with antikaon condensates i.e., mass and radius seem to be in resonable agreement with other theoretical and observational data.