We analyze the impact of the $\sigma$-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 $\sigma$-cut potential, influencing the stiffness of the equation of state at high densities, is governed by a free parameter $f_s$ that is constrained by observational data. Our analysis shows that for all values of $f_s$, neutron star configurations with antikaon condensates can exceed $2M_{\odot }$ 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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• Equations of state of nuclear matter
• Nuclear astrophysics
• Nuclear forces
• Nuclear matter in neutron stars