Some Observational Consequences of Brane World Cosmologies

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dc.creatorAlcaniz, J. S.
dc.date2002-02-26
dc.date2002-05-17
dc.date.accessioned2026-07-07T11:28:52Z
dc.date.available2026-07-07T11:28:52Z
dc.descriptionThe presence of dark energy in the Universe is inferred directly and indirectly from a large body of observational evidence. The simplest and most theoretically appealing possibility is the vacuum energy density (cosmological constant). However, although in agreement with current observations, such a possibility exacerbates the well known cosmological constant problem, requiring a natural explanation for its small, but nonzero, value. In this paper we focus our attention on another dark energy candidate, one arising from gravitational \emph{leakage} into extra dimensions. We investigate observational constraints from current measurements of angular size of high-$z$ compact radio-sources on accelerated models based on this large scale modification of gravity. The predicted age of the Universe in the context of these models is briefly discussed. We argue that future observations will enable a more accurate test of these cosmologies and, possibly, show that such models constitute a viable possibility for the dark energy problem.
dc.description6 pages, 4 figures, to appear in Phys. Rev. D (minor revisions)
dc.identifierhttps://arxiv.org/abs/astro-ph/0202492
dc.identifierhttp://arxiv.org/abs/astro-ph/0202492
dc.identifierPhys.Rev.D65:123514,2002
dc.identifierdoi:10.1103/PhysRevD.65.123514
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/196538
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleSome Observational Consequences of Brane World Cosmologies
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