Evolution from Pure States into Mixed States in de Sitter Space

Details Evolution from Pure States into Mixed States in de Sitter Space Evolution from Pure States into Mixed States in de Sitter Space

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pthph..79..442s&link_type=abstract

Progress of Theoretical Physics, Vol. 79, No. 2, pp. 442-453

Physics

29

Scientific paper

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.

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