Antikaons in neutron star studied with recent versions of relativistic mean-field models

TL;DR

This paper investigates how different relativistic mean-field models, including additional couplings, affect neutron star properties with antikaon condensation, highlighting the importance of model parameters at high densities.

Contribution

It introduces the impact of additional couplings in RMF models on neutron star properties with antikaons, using various models like NL3, G1, G2, and FSU2.1.

Findings

Antikaon condensation onset depends on Lagrangian parameters.

Additional couplings significantly influence high-density neutron star behavior.

Model choice affects mass-radius relations and effective masses.

Abstract

We study the impact of additional couplings in the relativistic mean field (RMF) models, in conjunction with antikaon condensation, on various neutron star properties. We analyze different properties such as in-medium antikaon and nucleon effective masses, antikaon energies, chemical potentials and the mass-radius relations of neutron star (NS). We calculate the NS properties with the RMF (NL3), E-RMF (G1, G2) and FSU2.1 models, which are quite successful in explaining several finite nuclear properties. Our results show that the onset of kaon condensation in NS strongly depends on the parameters of the Lagrangian, especially the additional couplings which play a significant role at higher densities where antikaons dominate the behavior of equation of state.