An inhomogeneous alternative to dark energy?

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dc.creatorAlnes, Havard
dc.creatorAmarzguioui, Morad
dc.creatorGron, Oyvind
dc.date2005-11-30
dc.date2006-04-18
dc.date.accessioned2026-07-07T06:48:57Z
dc.date.available2026-07-07T06:48:57Z
dc.descriptionRecently, there have been suggestions that the apparent accelerated expansion of the universe is not caused by repulsive gravitation due to dark energy, but is rather a result of inhomogeneities in the distribution of matter. In this work, we investigate the behaviour of a dust dominated inhomogeneous Lemaitre-Tolman-Bondi universe model, and confront it with various astrophysical observations. We find that such a model can easily explain the observed luminosity distance-redshift relation of supernovae without the need for dark energy, when the inhomogeneity is in the form of an underdense bubble centered near the observer. With the additional assumption that the universe outside the bubble is approximately described by a homogeneous Einstein-de Sitter model, we find that the position of the first CMB peak can be made to match the WMAP observations. Whether or not it is possible to reproduce the entire CMB angular power spectrum in an inhomogeneous model without dark energy, is still an open question.
dc.description8 pages (REVTeX4), 4 figures. v2: Minor changes to text plus added some references. Accepted for publication in PRD
dc.identifierhttps://arxiv.org/abs/astro-ph/0512006
dc.identifierhttp://arxiv.org/abs/astro-ph/0512006
dc.identifierPhys.Rev. D73 (2006) 083519
dc.identifierdoi:10.1103/PhysRevD.73.083519
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/104161
dc.subjectAstrophysics
dc.titleAn inhomogeneous alternative to dark energy?
dc.typetext

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