Year: 2012
Type: article
Abstract: We present a new scheme for the general computation of cosmic propagators that allow to interpolate between standard perturbative results at low $k$ and their expected large-$k$ resummed behavior. This scheme is applicable to any multipoint propagator and allows the matching of perturbative low-$k$ calculations to any number of loops to their large-$k$ behavior, and can potentially be applied in case of nonstandard cosmological scenarios such as those with non-Gaussian initial conditions. The validity of our proposal is checked against previous prescriptions and measurements in numerical simulations showing a remarkably good agreement. Such a generic prescription for multipoint propagators provides the necessary building blocks for the computation of polyspectra in the context of the so-called $\ensuremath{\Gamma}$ expansion introduced by F. Bernardeau, M. Crocce, and R. ScoccimarroPhys. Rev. D 78, 103521 (2008).. As a concrete application we present a consistent calculation of the matter bispectrum at one-loop order.
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2335636997