A Phantom does not Result from a Backreaction

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dc.creatorTanaka, Hisako
dc.creatorFutamase, Toshifumi
dc.date2006-12-06
dc.date2007-01-04
dc.date.accessioned2026-07-07T11:00:23Z
dc.date.available2026-07-07T11:00:23Z
dc.descriptionThe backreaction of nonlinear inhomogeneities to the cosmic expansion is analyzed in the framework of general relativity with a cosmological constant. By defining the spatially averaged matter energy density, we find that the cosmological constant induces a new type of backreaction whose equation of state is $p=-4/3 ρ$, where $ρ$ and $p$ are the effective energy density and effective pressure of the backreaction in the averaged Friedmann universe. However, the effective density is negative, and thus it decreases the acceleration caused by the cosmological constant.
dc.description6pages, accepted by Progress of Theoretical Physics
dc.identifierhttps://arxiv.org/abs/astro-ph/0612151
dc.identifierhttp://arxiv.org/abs/astro-ph/0612151
dc.identifierProg.Theor.Phys.117:183-188,2007
dc.identifierdoi:10.1143/PTP.117.183
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187667
dc.subjectAstrophysics
dc.titleA Phantom does not Result from a Backreaction
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