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Stochastic Dynamics of Coarse-Grained Quantum Fields in Inflationary Universe

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arxiv gr-qc/9401030 v1 pith:KFRUHNGK submitted 1994-01-26 gr-qc

Stochastic Dynamics of Coarse-Grained Quantum Fields in Inflationary Universe

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keywords quantumclassicalcoarse-grainedfieldstatestochastictheorybundle
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It is shown how coarse-graining of quantum field ^M theory in de Sitter space leads to the emergence of a classical ^M stochastic description as an effective theory in the infra-red regime. ^M The quantum state of the coarse-grained scalar field is found to be a highly^M squeezed coherent state, whose center performs a random walk on a^M bundle of classical trajectories.^M

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Cited by 1 Pith paper

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    Gravitational self-interactions alone decohere super-Hubble inflationary fluctuations with purity loss growing as (aH/k)^5, faster than the a^3 growth of earlier calculations.