Particle creation and warm inflation

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dc.creatorAarts, Gert
dc.creatorTranberg, Anders
dc.date2007-01-24
dc.date2007-05-01
dc.date.accessioned2026-07-07T11:02:37Z
dc.date.available2026-07-07T11:02:37Z
dc.descriptionDuring cosmological inflation, it has been suggested that fields coupled to the inflaton can be excited by the slow-rolling inflaton into a quasi-stable non-vacuum state. Within this scenario of ``warm inflation'', this could allow for a smooth transition to a radiation dominated Universe without a separate reheating stage and a modification of the slow roll evolution, as the heat-bath backreacts on the inflaton through friction. In order to study this from first principles, we investigate the dynamics of a scalar field coupled to the inflaton and N light scalar boson fields, using the 2PI-1/N expansion for nonequilibrium quantum fields. As a first step we restrict ourselves to Minkowski spacetime, interpret the inflaton as a time-dependent background, and use vacuum initial conditions. We find that the dominant effect is particle creation at late stages of the evolution due to the effective time-dependent mass. The further transfer of energy to the light degrees of freedom and subsequent equilibration only occurs after the end of inflation. As a consequence, the adiabatic constraint, which is assumed in most studies of warm inflation, is not satisfied when starting from an initial vacuum state.
dc.description14 pages, 4 eps figures; minor changes, refs added, to appear in PLB
dc.identifierhttps://arxiv.org/abs/hep-ph/0701205
dc.identifierhttp://arxiv.org/abs/hep-ph/0701205
dc.identifierPhys.Lett.B650:65-71,2007
dc.identifierdoi:10.1016/j.physletb.2007.04.055
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/188313
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Theory
dc.titleParticle creation and warm inflation
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