Search results for "Local Void"

showing 2 items of 2 documents

Impact of cosmic inhomogeneities on SNe observations

2009

We study the impact of cosmic inhomogeneities on the interpretation of SNe observations. We build an inhomogeneous universe model that can confront supernova data and yet is reasonably well compatible with the Copernican Principle. Our model combines a relatively small local void, that gives apparent acceleration at low redshifts, with a meatball model that gives sizeable lensing (dimming) at high redshifts. Together these two elements, which focus on different effects of voids on the data, allow the model to mimic the concordance model.

Cosmology and Nongalactic Astrophysics (astro-ph.CO)media_common.quotation_subjectgr-qcCosmic background radiationFOS: Physical sciencesAstrophysicsGeneral Relativity and Quantum Cosmology (gr-qc)Astrophysics::Cosmology and Extragalactic Astrophysics01 natural sciences114 Physical sciencesGeneral Relativity and Quantum CosmologyCosmologysymbols.namesakeObservational cosmology0103 physical sciences010306 general physicsmedia_commonPhysicsCOSMIC cancer database010308 nuclear & particles physicsCopernican principleRedshiftUniverseLocal Voidsymbolsastro-ph.COAstrophysics - Cosmology and Nongalactic Astrophysics
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Observational constraints on the LLTB model

2010

We directly compare the concordance LCDM model to the inhomogeneous matter-only alternative represented by LTB void models. To achieve a "democratic" confrontation we explore LLTB models with non-vanishing cosmological constant and perform a global likelihood analysis in the parameter space of cosmological constant and void radius. In our analysis we carefully consider SNe, Hubble constant, CMB and BAO measurements, marginalizing over spectral index, age of the universe and background curvature. We find that the LCDM model is not the only possibility compatible with the observations, and that a matter-only void model is a viable alternative to the concordance model only if the BAO constrain…

PhysicsCosmology and Nongalactic Astrophysics (astro-ph.CO)Age of the universeFOS: Physical sciencesAstronomy and AstrophysicsLambda-CDM modelCosmological constantAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsGeneral Relativity and Quantum Cosmology (gr-qc)General Relativity and Quantum CosmologyMetric expansion of spaceLocal Voidsymbols.namesakesymbolsDark energyBaryon acoustic oscillationsStatistical physicsAstrophysics - Cosmology and Nongalactic AstrophysicsHubble's law
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