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

Non linear evolution of BAO and IR - resummation

17 Dec 2015, 15:03
21m
Level 2, Room 7&8 (International Conference Centre Geneva)

Level 2, Room 7&8

International Conference Centre Geneva

Speaker

Mikhail Ivanov (Ecole Polytechnique Federale de Lausanne (CH))

Description

Baryon acoustic oscillations (BAO) provide us with one of the most powerful cosmological probes. However, the BAO are plagued by non-linear effects which must be taken into account. I will discuss these effects and their physical impact on correlation functions in real and momentum spaces. I will present a new technique (so-called 'IR — resummation') to account for these effects to all orders in standard Eulerian perturbation theory and time-sliced perturbation theory. I will show that leading and next-to-leading IR — resummation ameliorates remarkably our understanding of two-point and higher-point statistics. Finally, I will touch on the contributions of short-wavelenght perturbations and discuss the possibility of ultraviolet renormalisation.

Primary author

Mikhail Ivanov (Ecole Polytechnique Federale de Lausanne (CH))

Co-authors

Diego Blas Temino (CERN) Mathias Garny (CERN) Sergey Sibiryakov (CERN & EPFL & INR RAS)

Presentation Materials