Cosmology seminar: Miguel Zumalacárregui Pérez: 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
discrepant at 3-sigma. This model is found to be highly disfavoured with
respect to LambdaCDM cosmologies in a Bayesian analysis.