November 16h -Thursday- 12:10

"Angular Redshift Fluctuations: A new Cosmological Observable"

Carlos Hernández-Monteagudo

(Centro de Estudios de Física del Cosmos de Aragón. CEFCA)

We present a new cosmological observable, consisting in the angular pattern of the fluctuations of redshifts of galaxies when weighted with a Gaussian of a given width and centered upon any given central redshift. We express the angular power spectrum of this angular field in terms of cosmological linear perturbation theory, and we find that this field depends on both the galaxy density and galaxy peculiar velocity field at that redshift. We compare our predictions to the outcome of cosmological numerical simulations, and explore the added value encoded in this observable when compared to standard statistics describing the large scale structure. We apply our methodology on real data provided by the BOSS galaxy survey and set constraints on the growth of cosmic velocities and the law of gravity throughout the cosmological history.

Facultad de Ciencias

Seminario de Física Teórica

Universidad de Zaragoza