Analysis reveals antikaon condensation impacts the equation of state in neutron stars, suggesting significant mass configurations.
We analyze the impact of the σ-cut potential on the properties of pure nucleonic neutron star matter containing an antikaon condensate within the relativistic mean field model. The UCIb and UCIc RMF models, which have been recently proposed and well-constrained, are utilized to explore the composition and structure of neutron stars with an antikaon condensate. The antikaon condensation component of the equation of state is determined based on experimental data from K^- atomic and kaon-nucleon scattering. The σ-cut potential, influencing the stiffness of the equation of state at high densities, is governed by a free parameter fₛ that is constrained by observational data. Our analysis shows that for all values of fₛ, neutron star configurations with antikaon condensates can exceed 2M_ in all cases. The calculated global properties of neutron stars with antikaon condensates, including mass and radius, are found to be in good agreement with other theoretical, and observational data.
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Iqbal et al. (2025) studied this question.
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