Modeling the clustering of dark-matter haloes in resummed perturbation theories

par Suchita Kulkarni (University of Bonn)

mardi 25 janv. 2011, 11:00 → 12:00 Europe/Paris

Auditorium M. Vivargent (LAPTH)

Measurement of power spectrum in the universe not only leads us to determine the cosmological parameters precisely, but also helps us understand the evolution of the inhomogeneities. Current generation galaxy surveys will probe the inhomogeneities at scales k ~ 0.1 h/Mpc. Many interesting observables like, baryon acoustic oscillations (BAO) exist in these regions. At these scales the standard treatment for calculating the matter power spectrum fails and one has to depend on numerical simulations. Renormalized perturbation theory (RPT) similar to field theory in particle physics has recently been developed in order to analytically determine the power spectrum at the desired scales. However, predicting matter power spectrum from observations gets further complicated as galaxies, one of the observables in these surveys, are not unbiased tracers of underlying dark matter distribution. In this talk, I review the RPT technique and address the issue of predicting evolution of the galaxy bias using same technique.

Slides Kulkarni