Cosmic Inhomogeneities and the Average Cosmological Dynamics

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dc.creatorParanjape, Aseem
dc.creatorSingh, T. P.
dc.date2008-06-21
dc.date2008-11-01
dc.date.accessioned2026-07-07T11:51:53Z
dc.date.available2026-07-07T11:51:53Z
dc.descriptionIf general relativity (GR) describes the expansion of the Universe, the observed cosmic acceleration implies the existence of a `dark energy'. However, while the Universe is on average homogeneous on large scales, it is inhomogeneous on smaller scales. While GR governs the dynamics of the \emph{in}homogeneous Universe, the averaged \emph{homogeneous} Universe obeys modified Einstein equations. Can such modifications alone explain the acceleration? For a simple generic model with realistic initial conditions, we show the answer to be `no'. Averaging effects negligibly influence the cosmological dynamics.
dc.description5 pages, 2 figures, revtex4; v3 -- Text shortened to match published version. Some typos fixed. No physics changes
dc.identifierhttps://arxiv.org/abs/0806.3497
dc.identifierhttp://arxiv.org/abs/0806.3497
dc.identifierPhys.Rev.Lett.101:181101,2008
dc.identifierdoi:10.1103/PhysRevLett.101.181101
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/204047
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleCosmic Inhomogeneities and the Average Cosmological Dynamics
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