28th Texas Symposium on Relativistic Astrophysics

TSPT: Time-Sliced Perturbation Theory for Large Scale Structure

14 Dec 2015, 17:35

20m

Level -1, Room 17 (International Conference Centre Geneva)

Talk 07 - Large scale structures

Speaker

Sergey Sibiryakov (CERN & EPFL & INR RAS)

Description

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.

Presentation materials

07_1735_Sibiryakov_TSPT.pdf