21 citations · 109 across the 13 of their papers we have counts for
6 papers · 1 filter
Quantum Field Theories in Nonextensive Tsallis Statistics
H. Kohyama, A. Niegawa
Within the framework of Tsallis statistics with q ~ 1, we construct a perturbation theory for treating relativistic quantum field systems. We find that there appear initial correla…
Comment on fermion propagator in real-time quantum-field theory at finite temperature and density
A. Niégawa
Two forms are available for the fermion propagator at finite temperature and density. It is shown that, when one deals with a diquark-condensation-operator inserted Green function…
Out of Equilibrium Quantum Field Theory --- Perturbation Theory and Generalized Boltzmann Equation
A. Niégawa
This paper describes perturbative framework, on the basis of the closed-time-path formalism, in terms of quasiparticle picture for studying quasiuniform relativistic quantum field…
Renormalization of number density in nonequilibrium quantum-field theory and absence of pinch singularities
A. Niégawa
Through introducing a notion of renormalization of particle-number density, a simple perturbation scheme of nonequilibrium quantum-field theory is proposed. In terms of the renorma…
Screening of mass singularities and finite soft-photon production rate in hot QCD
A. Niégawa
The production rate of a soft photon from a hot quark-gluon plasma is computed to leading order at logarithmic accuracy. The canonical hard-thermal-loop resummation scheme leads to…
Production of soft photons from the quark-gluon plasma in hot QCD- Screening of mass singularities
A. Niégawa
It has been reported that, within the hard-thermal-loop resummation scheme, the production rate of soft real photons from a hot quark-gluon plasma exhibits unscreened mass singular…