Extended Chiral (σ,π,ω) Mean‐Field Model with Vacuum Fluctuation Corrections

摘要

Density‐dependent relations among saturation properties of symmetric nuclear matter and properties of hadronic stars are discussed by applying the conserving chiral nonlinear (σ,π,ω) mean‐field theory. The chiral nonlinear (σ,π,ω) mean‐field theory is an extension of the conserving nonlinear (nonchiral) σ‐ω mean‐field theory, which is thermodynamically consistent, relativistic and Lorentz‐covariant. In the extended chiral (σ,π,ω) mean‐field model, all the masses of hadrons are produced by the spontaneous chiral symmetry breaking, which is different from conventional chiral partner models. By comparing both nonchiral and chiral mean‐field approximations, the effects of the chiral symmetry breaking mechanism on the mass of σ‐meson, coefficients of nonlinear interactions and Fermi‐liquid properties are investigated in nuclear matter and neutron stars.