Backreaction of superhorizon perturbations in scalar field cosmologies

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dc.creatorKumar, Naresh
dc.creatorFlanagan, Eanna E.
dc.date2008-08-07
dc.date2008-08-08
dc.date.accessioned2026-07-07T11:45:23Z
dc.date.available2026-07-07T11:45:23Z
dc.descriptionIt has been suggested that the acceleration of the Universe may be due to the backreaction of perturbations to the Friedmann-Robertson-Walker background. For a Universe dominated by cold dark matter, it is known that the backreaction of superhorizon perturbations can not drive acceleration. We extend this result to models with cold dark matter together with a scalar field. We show that the scalar field can drive acceleration only via the standard mechanism of a constant or nearly constant piece of its potential (i.e., a cosmological constant); there is no separate mechanism involving superhorizon backreaction. This rules out some models which have been proposed in the literature.
dc.description5 pages
dc.identifierhttps://arxiv.org/abs/0808.1043
dc.identifierhttp://arxiv.org/abs/0808.1043
dc.identifierPhys.Rev.D78:063537,2008
dc.identifierdoi:10.1103/PhysRevD.78.063537
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/201861
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleBackreaction of superhorizon perturbations in scalar field cosmologies
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