Effects of Fock term, tensor coupling and baryon structure variation on a neutron star

• Published in: Physics letters. B Vol. 709; no. 3; pp. 242 - 246
• Main Authors: Miyatsu, Tsuyoshi, Katayama, Tetsuya, Saito, Koichi
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 19.03.2012; Elsevier
• Subjects: Approximation; Baryons; Couplings; Elementary particles; Equation of state; Exact sciences and technology; Joining; Mathematical analysis; Neutron stars; Nuclear physics; Physics; Quark–meson coupling model; Relativistic Hartree–Fock calculation; Tensor interaction; Tensors; The physics of elementary particles and fields; Quark–meson coupling model; Tensor interaction; Neutron stars; Relativistic Hartree–Fock calculation; Equation of state; Hartree-Fock calculations; Equations of state; Stellar mass; Quark model; Vector mesons; Internal structure; Neutrons; Baryons
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2012.02.009

The equation of state for neutron matter is calculated within relativistic Hartree–Fock approximation. The tensor couplings of vector mesons to baryons are included, and the change of baryon internal structure in matter is also considered using the quark–meson coupling model. We obtain the maximum neutron-star mass of ∼2.0M⊙, which is consistent with the recently observed, precise mass, 1.97±0.04M⊙. The Fock contribution is very important and, in particular, the inclusion of tensor coupling is vital to obtain such large mass. The baryon structure variation in matter also enhances the mass of a neutron star.