13-18 December 2015
International Conference Centre Geneva
Europe/Zurich timezone

TSPT: Time-Sliced Perturbation Theory for Large Scale Structure

14 Dec 2015, 17:35
Level -1, Room 17 (International Conference Centre Geneva)

Level -1, Room 17

International Conference Centre Geneva

17 Rue de Varembé, 1211 Geneva


Sergey Sibiryakov (CERN & EPFL & INR RAS)


I will present a new perturbative approach to the description of cosmological structures in the mildly non-linear regime relevant at the distance scales from 10 to 100 Mpc. In this framework equal-time correlation functions of cosmological perturbations are calculated using an ensemble with time-dependent statistical weight. The scheme is free from unphysical infrared divergencies plaguing the traditional approaches and allows a systematic resummation of large infrared contributions to all orders of the perturbation theory. This greatly improves the description of the density power spectrum in the region of baryon acoustic oscillations. I will mention future directions, which include infrared resumption of higher-point correlation functions and renormalisation of the contributions coming from short-wavelength modes.

Primary author

Sergey Sibiryakov (CERN & EPFL & INR RAS)

Presentation Materials