Eur. Phys. J. A (2014) 50: 80
https://doi.org/10.1140/epja/i2014-14080-3

Regular Article - Theoretical Physics

Constraints on the properties of the massive neutron star PSR J0348+0432 from the f₀(975) and φ(1020) mesons

College of Mechanical and Electronic Engineering, Chuzhou University, 239000, Chuzhou, China

^* e-mail: zhaopioneer.student@sina.com

Received: 3 December 2013
Revised: 15 March 2014
Accepted: 3 April 2014
Published online: 2 May 2014

Abstract

The effect of the f ₀(975) and φ(1020) mesons on the properties of the massive neutron star PSR J0348+0432 is examined in the framework of the relativistic mean-field theory by choosing the suitable hyperon coupling constants. It is found that, compared with that without the f ₀(975) and φ(1020) mesons, the radius of the neutron star PSR J0348+0432 increases from R = 12.072 km to R = 12.08 km (i.e. by 0.07%), the central energy density ɛ _c decreases from 5.6695 fm⁻⁴ to 5.6492 fm⁻⁴ (i.e. by 0.36%), the central pressure decreases from 1.585 fm⁻⁴ to 1.58 fm⁻⁴ (i.e. by 0.32%), the moment of inertia increases from 1.4592 × 10⁴⁵ g · cm² to 1.4615 × 10⁴⁵ g · cm² (i.e. by 0.16%) and the surface gravitational redshift decreases from z = 0.4026 to z = 0.4022 (i.e. by 0.1%). Our results show that the effect of the f ₀(975) and φ(1020) mesons on the properties of the massive neutron star PSR J0348+0432 is very small (i.e. no more than 0.5%) and therefore they do not play a major role.