Studying the parameters of the extended σ-ω model for neutron star matter

In this work we study the parameters of the extended σ-ω model for neutron star matter by a Bayesian analysis of state-of-the-art multi-messenger astronomy observations, namely mass, radius and tidal deformabilities. We have considered three parameters of the model, the Landau mass m_L, the nuclear compressibility K₀, and the value of the symmetry energy S₀, all at saturation density n₀. As a result, we are able to estimate the best values of the Landau mass of m_L ≈ 0.73 GeV, whereas the values of K₀ and S₀ fall within already known empirical values. Furthermore, for neutron stars we find the most probable value of 13 km < R_1.4 < 13.5 km and the upper mass limit of M_max ≈ 2.2 M_⊙.