Coarse graining and decoherence in quantum field theory

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dc.creatorLombardo, Fernando
dc.creatorMazzitelli, Francisco
dc.date1995-08-11
dc.date.accessioned2026-07-07T11:35:57Z
dc.date.available2026-07-07T11:35:57Z
dc.descriptionWe consider a $λϕ^4$ theory in Minkowski spacetime. We compute a "coarse grained effective action" by integrating out the field modes with wavelength shorter than a critical value. From this effective action we obtain the evolution equation for the reduced density matrix (master equation). We compute the diffusion coefficients of this equation and analyze the decoherence induced on the long- wavelength modes. We generalize the results to the case of a conformally coupled scalar field in DeSitter spacetime. We show that the decoherence is effective as long as the critical wavelength is taken to be not shorter than the Hubble radius.
dc.description21 pages (RevTeX) and 5 encapsulated postscript figures
dc.identifierhttps://arxiv.org/abs/hep-th/9508052
dc.identifierhttp://arxiv.org/abs/hep-th/9508052
dc.identifierPhys.Rev.D53:2001-2011,1996
dc.identifierdoi:10.1103/PhysRevD.53.2001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/198768
dc.subjectHigh Energy Physics - Theory
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleCoarse graining and decoherence in quantum field theory
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