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Confronting Lemaitre-Tolman-Bondi models with Observational Cosmology

AutorGarcía-Bellido, Juan ; Haugboelle, Troels
Palabras claveAstrophysics
Fecha de publicación28-feb-2008
CitaciónarXiv:0802.1523v2 [astro-ph]
ResumenThe possibility that we live in a special place in the universe, close to the center of a large void, seems an appealing alternative to the prevailing interpretation of the acceleration of the universe in terms of a LCDM model with a dominant dark energy component. In this paper we confront the asymptotically flat Lemaitre-Tolman-Bondi (LTB) models with a series of observations, from Type Ia Supernovae to Cosmic Microwave Background and Baryon Acoustic Oscillations data. We propose two concrete LTB models describing a local void in which the only arbitrary functions are the radial dependence of the matter density Omega_M and the Hubble expansion rate H. We find that all observations can be accommodated within 1 sigma, for our models with 4 or 5 independent parameters. The best fit models has a chi^2 very close to that of the LCDM model. We perform a simple Bayesian analysis and show that one cannot exclude the hypothesis that we live within a large local void of an otherwise Einstein-deSitter model.
DescripciónSubmitted on 12 Feb 2008 (v1), last revised 28 Feb 2008 (this version, v2).-- Added references.-- 27 pages, 8 figures.-- A general Fortran program for comparing LTB models with cosmological observations, that has been used to make the parameter scan in this paper is made public, and can be downloaded at: http://www.phys.au.dk/~haugboel/software.shtml.-- Match version submitted to JCAP.
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