Observational constraints on the ΛLTB model
- Department of Physics, PL 35 (YFL), FI-40014 University of Jyväskylä (Finland)
We directly compare the concordance ΛCDM model to the inhomogeneous matter-only alternative represented by LTB void models. To achieve a ''democratic'' confrontation we explore ΛLTB 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 ΛCDM 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 ΛCDM models.
- OSTI ID:
- 22275245
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2010, Issue 12; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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