☆ 4.6 Article

Time-sliced perturbation theory with primordial non-Gaussianity and effects of large bulk flows on inflationary oscillating features

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2019)

Journal

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS

Volume -, Issue 9, Pages -

Publisher

IOP Publishing Ltd

DOI: 10.1088/1475-7516/2019/09/037

Keywords

baryon acoustic oscillations; cosmic web; inflation; power spectrum

Categories

Astronomy & Astrophysics Physics, Particles & Fields

Funding

RFBR [17-02-01008, 17-02-00651]
Swiss National Science Foundation
Danish National Research Foundation [DNRF91]
Simons Foundation's Origins of the Universe program

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Abstract

We extend the formalism of time-sliced perturbation theory (TSPT) for cosmological large-scale structure to include non-Gaussian initial conditions. We show that in such a case the TSPT interaction vertices acquire new contributions whose time-dependence factorizes for the Einstein-de Sitter cosmology. The new formulation is free from spurious infrared (IR) enhancements and reveals a clear IR structure of non-Gaussian vertices. We use the new technique to study the evolution of oscillating features in primordial statistics and show that they are damped due to non-linear effects of large bulk flows. We derive the damping factors for the oscillating primordial power spectrum and bispectrum by means of a systematic IR resummation of relevant Feynman diagrams.

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