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Prog. Theor. Phys. Vol. 79 No. 2 (1988) pp. 442-453

Evolution from Pure States into Mixed States in de Sitter Space

Masa-aki Sakagami

Research Institute for Fundamental Physics, Kyoto University, Kyoto 606

(Received October 13, 1987)

Abstract:

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.

URL : http://ptp.ipap.jp/link?PTP/79/442/
DOI : 10.1143/PTP.79.442

[ Full Text PDF : FREE ACCESS (618K) ] Citation: Plain Text BiBTeX EndNote(RIS) RSS

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Citing Article(s) :

1. Progress of Theoretical Physics Vol. 91 No. 2 (1994) pp. 219-236 :

   Derivation of Master Equation for Totally Quadratic System in Quantum Brownian Motion

   Takashi Okamura

2. Progress of Theoretical Physics Vol. 95 No. 4 (1996) pp. 703-716 :

   Numerical Evaluation of Evolution of Density Matrix and Decoherence Due to Non-Linear Dynamics

   Masa-aki Sakagami, Hiroto Kubotani and Takashi Okamura

3. Progress of Theoretical Physics Supplement No.116 (1994) pp. 393-401 :

   Emergence of Classical Properties from Quantum Theory

   Masa-aki Sakagami

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