Prog. Theor. Phys. Vol. 79 No. 2 (1988) pp. 442-453
Evolution from Pure States into Mixed States in de Sitter Space
Research Institute for Fundamental Physics, Kyoto University, Kyoto 606
(Received October 13, 1987)
An attempt is made to clarify realization of a classical distribution from quantum fluctuations of the order parameter in the inflationary universe. We discuss destruction of quantum coherence associated with a state of the order parameter in models where it interacts with the environment. For that purpose, the time evolution of the reduced density matrix \tildeρ, which is obtained by coarse-graining of the environment, is investigated. It is shown that off-diagonal elements of \tildeρ decreased as the phase transition proceeds.
DOI : 10.1143/PTP.79.442
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Citing Article(s) :
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Numerical Evaluation of Evolution of Density Matrix and Decoherence Due to Non-Linear Dynamics
Masa-aki Sakagami, Hiroto Kubotani and Takashi Okamura
Progress of Theoretical Physics Supplement No.116 (1994) pp. 393-401
Emergence of Classical Properties from Quantum Theory