Effects of ${\varphi }_0$-meson on the EOS of hyperon star in the relativistic mean field model

Abstract

Nuclear effective interactions are considered as a vital tool to guide into the region of the high degree of isospin asymmetry and density. We take varieties of parameter sets of the RMF model to show the parametric dependence of the hyperon star properties. We add ${\varphi }_0$-meson to $\sigma$-$\omega$-$\rho$ model. The effects of ${\varphi }_0$-meson on the equation of state and consequently on the maximum mass of the hyperon star are discussed. Due to the inclusion of ${\varphi }_0$-meson the threshold density of different hyperon production shift to higher density region. The effects of the hyperon-meson coupling constants on the maximum mass and radius of the hyperon stars are discussed.