Quantum kinetic theory for fermions in temporally varying backrounds

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dc.creatorHerranen, Matti
dc.creatorKainulainen, Kimmo
dc.creatorRahkila, Pyry Matti
dc.date2008-07-09
dc.date.accessioned2026-07-07T12:55:07Z
dc.date.available2026-07-07T12:55:07Z
dc.descriptionWe derive quantum kinetic equations for fermions in a homogeneous time-dependent background in presence of decohering collisions, by use of the Schwinger-Keldysh CTP-formalism. The quantum coherence (between particles and antiparticles) is found to arise from new spectral solutions for the dynamical 2-point correlation function in the mean field limit. The physical density matrix $ρ$ and its dynamics is shown to be necessarily dependent on the extrenous information on the system, and expressions that relate $ρ$ to fundamental coherence functions and fermionic particle and antiparticle numbers are derived. For an interacting system we demonstrate how smooth decoherence effects are induced by collisions. As special applications we study the production of unstable particles during the preheating stage of the inflation and an evolution of an initially quantum $ρ$ towards a statistical limit including decoherence and thermalisation.
dc.description34 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/0807.1435
dc.identifierhttp://arxiv.org/abs/0807.1435
dc.identifierJHEP 0809:032,2008
dc.identifierdoi:10.1088/1126-6708/2008/09/032
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/224161
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Theory
dc.titleQuantum kinetic theory for fermions in temporally varying backrounds
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