6533b861fe1ef96bd12c44f3
RESEARCH PRODUCT
Observational constraints on the LLTB model
Mikko PääkkönenMikko PääkkönenValerio MarraValerio Marrasubject
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 lawdescription
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 constraints are relaxed. Moreover, we will show that the areas of the parameter space which give a good fit to the observations are always disconnected with the result that a small local void does not significantly affect the parameter extraction for LCDM models.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-09-21 |