Centre de Physique Théorique


Vendredi 30 juin 2017

14h00 – 15h00, Amphi 5 du CPT

Investigating matter power-spectrum and relativistic effects in Large scale structure

Elena Giusarma (Berkeley)

Large-scale structure of the Universe provides a powerful probe to constraint the cosmic expansion history, the cosmological distance scale, the growth rate, the dark energy properties, models of gravity and the initial conditions of our Universe. Moreover a good knowledge of large-scale power spectrum would allow one to improve our ability to constrain cosmological parameters, such as massive neutrinos.
In the first part of this seminar I will present a method to recover the information on the true matter power spectrum in real space combining CMB lensing convergence maps and galaxy maps and I will illustrate the effect of this method on the constraints of neutrino masses.
In the second part of the seminar I will investigate how relativistic effects distort the observed pattern of the large-scale structure. In particular I will discuss the asymmetry in the two-point cross-correlation function of two populations of galaxies, focusing on the gravitational redshift effect, and I will present the first detection of this redshift asymmetry using the Sloan Digital Sky Survey DR12 CMASS galaxy sample.