Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 12, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2010/12/021
Keywords
supernova type Ia - standard candles; baryon acoustic oscillations; cosmological parameters from CMBR; dark energy theory
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We directly compare the concordance Lambda CDM model to the inhomogeneous matter-only alternative represented by LTB void models. To achieve a democratic confrontation we explore Lambda LTB 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 Lambda CDM 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 Lambda CDM models.
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