Speaker
Description
In this talk I will introduce angular redshift fluctuations (ARF), a novel cosmological observable that, contrary to other standard probes that measure the counts and the shapes of galaxies, looks at the galaxies' redshifts and their fluctuations when projected under any given redshift shell. I will show ARF are found to be extremely sensitive to radial peculiar velocities, and also to the underlying density field. This means they are sensitive to the baryonic acoustic oscillations (BAO), and together with standard 2D angular clustering, ARF provide a unique window to the BAO in angle and redshift space. ARF have been applied to BOSS spectroscopic, measuring the growth rate and setting very strong constrains on deviations from general relativity. They have also been applied on photometric galaxy surveys like QUAIA, unveiling ARF's great complementary power ni searches for the non-Gaussianity parameter $f_{\rm NL}$. I will conclude by discussing ARF's potential to provide alternative measurements of key cosmological and fundamental parameters when combined with 2D clustering and CMB lensing.
