Eur. Phys. J. Special Topics 229, 3615–3628 (2020)
https://doi.org/10.1140/epjst/e2020-000106-4

Regular Article

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

¹ Henryk Niewodniczański Institute of Nuclear Physics, PL-31-342 Cracow, Poland
² Bogoliubov Laboratory of Theoretical Physics, JINR, 141980 Dubna, Russia
³ Laboratory of Information Technologies, JINR Dubna, 141980 Dubna, Russia
⁴ Computational Physics and IT Division, A.I. Alikhanyan National Science Laboratory, 0036 Yerevan, Armenia
⁵ Wigner Research Centre for Physics, 1121 Budapest, Hungary
⁶ Department for Theoretical Physics, Yerevan State University, 0025 Yerevan, Armenia

^a e-mail: dalvarez@ifj.edu.pl

Received: 2 June 2020
Accepted: 27 October 2020
Published online: 21 December 2020

Abstract

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_⊙.