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- W55988520 abstract "We first summarize the common features and physically profound differences between various kinds of noise in pure states caused by the Bogoliubov transformation in such diverse phenomena as the squeezed state in quantum optics, Hawking radiation around the eternal black hole, and thermal physics. We find that all the thermal vacua form a set of states degenerate in eigenvalues of the Hamiltonian Ĥ, i.e., the zero hat-energy states. The presence of these degenerate states exhibits the spontaneous breakdown of weak Bogoliubov symmetry. The thermal freedom is the freedom of moving through the states in this degenerate set. Considering a time-dependent movement of a thermal vacuum through the degenerate set, we obtain the time-dependent thermo field dynamics. With this formalism we set up a quasi-particle picture and analyze the spectral representation of the Heisenberg two point Green's function and the diagonalization of the quasi-particle Hamiltonian. The formalism will be used in discussion of the appearance of short time intermediate high-temperature states when the initial state is at practically zero temperature." @default.
- W55988520 created "2016-06-24" @default.
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- W55988520 date "1991-01-01" @default.
- W55988520 modified "2023-09-27" @default.
- W55988520 title "Origin of Non-Quantum Noise and Time Dependent Thermo Field Dynamics" @default.
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- W55988520 doi "https://doi.org/10.1016/b978-0-444-88903-4.50020-2" @default.
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