Observational constraints on the LLTB model

Details Observational constraints on the LLTB model Observational constraints on the LLTB model

2010-09-21

arxiv.org/abs/1009.4193v3

JCAP12(2010)021

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

JHEP style: 23 pages, 6 figures; replaced to match the improved version accepted for publication in JCAP. The Mathematica pack

Scientific paper

10.1088/1475-7516/2010/12/021

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.

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