Evolution of density perturbations in decaying vacuum cosmology

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dc.creatorBorges, H. A.
dc.creatorCarneiro, S.
dc.creatorFabris, J. C.
dc.creatorPigozzo, C.
dc.date2007-11-16
dc.date2008-02-12
dc.date.accessioned2026-07-07T11:13:16Z
dc.date.available2026-07-07T11:13:16Z
dc.descriptionWe study cosmological perturbations in the context of an interacting dark energy model, in which the cosmological term decays linearly with the Hubble parameter, with concomitant matter production. A previous joint analysis of the redshift-distance relation for type Ia supernovas, baryonic acoustic oscillations, and the position of the first peak in the anisotropy spectrum of the cosmic microwave background has led to acceptable values for the cosmological parameters. Here we present our analysis of small perturbations, under the assumption that the cosmological term, and therefore the matter production, are strictly homogeneous. Such a homogeneous production tends to dilute the matter contrast, leading to a late-time suppression in the power spectrum. Nevertheless, an excellent agreement with the observational data can be achieved by using a higher matter density as compared to the concordance value previously obtained. This may indicate that our hypothesis of homogeneous matter production must be relaxed by allowing perturbations in the interacting cosmological term.
dc.descriptionRevised version. To appear in Physical Review D
dc.identifierhttps://arxiv.org/abs/0711.2689
dc.identifierhttp://arxiv.org/abs/0711.2689
dc.identifierPhys.Rev.D77:043513,2008
dc.identifierdoi:10.1103/PhysRevD.77.043513
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/191659
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleEvolution of density perturbations in decaying vacuum cosmology
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