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Quantum Field Theory in Postwar Japan Early Works of H Umezawa
Hiroomi Umezawa his Physics and Research
S Kamefuchi Int J Mod Phys B 10 18071829 1996
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Alberta Arimitsu Bogoliubov transformation boson C-meson canonical charged particles coefficient commutation relations consider corresponding counter terms coupling constant defined degrees of freedom denote density dependent derived discussed dissipative divergence dynamical map effect electromagnetic electron elementary particles energy equation equilibrium expectation value expression fermion Feynman diagram finite temperature Fock space formalism gauge given Goldstone Green's function Heisenberg fields Heisenberg operators integration interaction representation introduce invariant Kamefuchi Lagrangian mass matrix meson method momentum nonequilibrium nucleon observable obtain paper parameter perturbation calculation phase phenomena photon Phys physical problem Prog propagator quantities quantum electrodynamics quantum field theory quasi-particle renormalization theory respectively result Sakata satisfies scalar self-consistent self-energy spin spinor statistical mechanics structure superconductivity superoperators symmetry Tachiki Theoretical thermal state condition thermal vacuum thermo field dynamics tilde conjugation time-dependent tion Umezawa unperturbed vacuum expectation value vacuum polarization vector zero