Time sliced perturbation theory for large scale structure

by Mikhail Ivanov (EPFL)

Wednesday 10 Feb 2016, 11:30 → 12:30 Europe/Zurich

4/2-011 - TH common room (CERN)

I will discuss a new analytic approach to describe cosmological structure formation in the mildly non-linear regime relevant at the scales from 10 to 100 Mpc. The key object of this approach is the time-dependent probability distribution function that generates the correlators of cosmological observables at a fixed redshift. I will show that the proposed method overcomes the notorious drawbacks of standard approaches, namely the appearance of non - physical enhancements from the very long (IR) and very short (UV) modes. I will demonstrate that our scheme is manifestly free of spurious IR contributions, which allows for the systematic resummation of physical IR effects relevant for the correct description of the baryon acoustic oscillations. Finally, I will show that our approach provides a natural framework to account for the influence of UV modes along the lines of the Wilsonian effective field theory.