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In order to systematically examine the possible maximum mass of neutronstars, which is one of the important properties characterizing the physics inhigh-density region, I construct neutron star models by adoptingphenomenological equations of state with various values of nuclear saturationparameters for low-density region, which are connected to the equation of statefor high-density region characterized by the possible maximum sound velocity inmedium. I derive an empirical formula for the possible maximum mass of neutronstar. If massive neutron stars are observed, it could be possible to get aconstraint on the possible maximum sound velocity for high-density region.

Effect of nuclear saturation parameters on possible maximum mass of neutron stars