Effective meson masses, effective meson-nucleon couplings and neutron star radii

Abstract

Using the generalized mean field theory, we have studied the relation among the effective meson masses, the effective meson-nucleon couplings and the equation of state (EOS) in asymmetric nuclear matter. If the effective omega-meson mass becomes smaller at high density, the EOS becomes stiffer. However, if we require that the omega-meson mean field is proportional to the baryon density, the effective omega-nucleon coupling automatically becomes smaller at the same time as the effective omega-meson mass becomes smaller. Consequently, the EOS becomes softer. A similar relation is found for the effective rho-meson mass and the effective rho-nucleon coupling. We have also studied the relation among the effective meson masses, the effective meson-nucleon couplings and a radius R of a neutron star. The R depends somewhat on the value of the effective omega-meson mass and the effective omega-nucleon coupling.

29pages, 24 figures

References in corpus (14)

• QCD Phenomenology based on a Chiral Effective Lagrangian
• A New Parameterization for the Lagrangian Density of Relativistic Mean Field Theory
• A Chiral Effective Lagrangian for Nuclei
• A quark-meson model for nuclear and neutron matter
• Dense Quark Matter in Nature
• Phase Transition in the chiral $\sigma$-$\omega$ model with dilatons
• Deformed Nuclei in a Chiral Model
• Nuclear and Neutron Star Radii
• Rotating Neutron Stars in a Chiral SU(3) Model
• A relation among the effective nucleon mass, the incompressibility and the effective $\sigma$-meson mass in nuclear matter
• Effective hadron masses and effective interactions in nuclear matter
• Effective hadron masses and couplings in nuclear matter and incompressibility
• Effects of Meson Mass Reduction on the Properties of Neutron Star Matter
• Relationship between Quark-Meson Coupling Model and Quantum Hadrodynamics

Cited by in corpus (5)

• Relativistic Mean-Field Models with Effective Hadron Masses and Coupling Constants, and rho^- Condensation
• Chiral phase transition in an extended NJL model with higher-order multi-quark interactions
• Constraints for weakly interacting light bosons from existence of massive neutron stars
• Simplified SIMPs and the LHC
• Dynamical coupled channel calculation of pion and omega meson production