8 papers
Auxiliary Field Meson Model at Finite Temperature and Density
H. Kouno, T. Sakaguchi, K. Kashiwa +4
Starting from many quark interactions, we construct a nonlinear sigma-omega model at finite temperature and density. The mesons are introduced as auxiliary fields. Effective quark-…
Auxiliary field method at finite temperature and/or finite density
Hiroaki Kouno
We discuss the relation between the effective vector meson mass and equation of state (EOS) for nuclear matter. In the mean field approximation, the EOS becomes softer due to the r…
The effective ω-meson mass with a vector field self-interaction
Katsuaki Sakamoto, Hiroaki Kouno, Akira Hasegawa +1
We calculate the effective mass m_ω^* of the ω-meson in nuclear medium by the σ-ωmodel with a vector field self-interaction (VFSI). We found that the direct and the indirect effect…
Nonlinear effects in Schwinger-Dyson Equation
Hiroaki Kouno, Akira Hasegawa, Masahiro Nakano +1
We study nonlinear effects in the QED ladder Schwinger-Dyson(SD) equation. Without further approximations, we show that all nonlinear effects in the ladder SD equation can be inclu…
Dispersion relations in quantum hadrodynamics with a finite cutoff
K. Sakamoto, H. Kouno, A. Hasegawa +1
The dispersion relations in the real and imaginary parts of the meson self-energies are studied to check the consistency of the "renormalization" in cutoff field theory. It is show…
Non-perturbative renormalization group equations and approximate discrete gamma_5-symmetry in quantum hadrodynamics
Hiroaki Kouno, Manabu Nakai, Akira Hasegawa +1
The quantum hadrodynamics are studied by using non-perturbative renormalization group equations. Approximate discrete gamma_5-symmetry is studied. It is shown that the contribution…