February 8 (Wed), 14:15 in A315   

Miguel Zumalacarregui (Barcelona U. and IFT-Madrid, Spain)


Tension in the void: New constraints on inhomogeneous cosmologies

I will discuss new constraints on inhomogeneous Lemaitre-Tolman-Bondi models as an alternative to Dark Energy, arising mainly from the inclusion of the higher redshift Baryon Acoustic Oscillation data from the WiggleZ collaboration. Assuming homogeneous big bang time and baryon fraction, the early time, quasi homogeneous limit of the model allows the computation of the BAO observables at different redshifts. LTB models with a CGBH profile are investigated using different cosmological data, finding that the amount of matter at the center of the void preferred by Supernovae and BAO is found to be discrepant at the 3-sigma level. This model is found to be highly disfavoured with respect to LambdaCDM cosmologies in a Bayesian analysis.