Le 12 juin 2015
De 10h30 à 12h00
Martin FEIX
Technion & IAP
Spatial variations in the distribution of galaxy luminosities, estimated from redshifts as distance proxies, are correlated with the peculiar velocity field. Comparing these variations with the peculiar velocities inferred from galaxy redshift surveys is a powerful test of gravity and dark energy theories on cosmological scales. Using galaxy data from the SDSS DR7, we perform this test and estimate the growth rate of density perturbations at z ~ 0.1. This unique measurement is complementary to those obtained with more traditional methods (including clustering analysis), and its accuracy is competitive with other methods when applied to similar datasets.