Speaker
Description
With ongoing advancements in nuclear theory and experimentation, coupled with a growing body of neutron star (NS) observations, a wealth of information concerning the equation of state (EOS) for matter at extreme densities has become accessible. In this talk, I will discuss the present status of NS EOS by combining this information using a comprehensive Bayesian statistics. We use a hybrid EOS formulation that connects the information obtained from nuclear theory at the lower densities which is then augmented by a generic 3-segment piecewise polytrope model at higher densities. Our approach integrates theoretical data from nuclear physics, including chiral effective field theory (χEFT) and perturbative quantum chromodynamics (pQCD), alongside observational data from NS mass measurements, X-ray observations, and gravitational wave detections from binary NS mergers. Our findings highlight that χEFT data significantly improve constraints on the EOS near nuclear saturation density along with astrophysical observations, while pQCD and nuclear experiments have less impact. Key parameters, such as the slope and curvature of the symmetry energy, the radius, and tidal deformability of a typical NS, and the maximum mass of non-rotating NSs, are estimated with high credibility.
