Estimation of the thermal degree of freedom in thermo field dynamics

Thermal degree of freedom in thermo field dynamics

A role of thermal state conditions in equilibrium and non-equilibrium thermo field dynamics

Thermal field theory using Thermo Field Dynamics (有限温度・有限密度の場の量子論とその応用)

Dynamical rearrangement of the thermal vacuum in thermo field dynamics

Closed string thermal torus from thermo field dynamics

Interacting thermal vacuum and noninteracting asymptotic states in thermo-field dynamics