Geneva University seminars

# On the non-linear scale of cosmological perturbation theory

## by Diego Blas Temino (CERN)

Friday, 19 April 2013 from to (Europe/Zurich)
at Geneva University ( Room 234 )
24 quai E. Ansermet, CH-1211 Genève 4
 Description Cosmological perturbation theory is an analytical tool to determine the dark matter power spectrum from the primordial fluctuations. However, it fails to converge at late times due to non-linear effects. In this talk we discuss several approaches to resummation in cosmological perturbation theory. After a short introduction, standard perturbation theory (SPT), renormalized perturbation theory (RPT) and the eikonal approximation are reviewed. Finally, a generalization to RPT is presented that elucidates the relation between these schemes.