Stochastic Dynamics of Coarse-Grained Quantum Fields in Inflationary Universe
Abstract
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 highlyM squeezed coherent state, whose center performs a random walk on aM bundle of classical trajectories.M
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