Publication : t11/223

Constructing Regularized Cosmic Propagators

Bernardeau F. (CEA, IPhT (Institut de Physique Théorique), F-91191 Gif-sur-Yvette, France)
Crocce M. (Institut de Ciencies de l’Espai, IEEC-CSIC, Campus UAB)
Scoccimarro R. (Department of Physics, New York University, 4 Washington Place, New York 10003, USA)
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 multi-point 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 non-standard 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 multi-point propagators provides the necessary building blocks for the computation of polyspectra in the context of the so-called Gamma-expansion introduced by Bernardeau et al. (2008). As a concrete application we present a consistent calculation of the matter bispectrum at one-loop order.
Année de publication : 2011
Revue : Phys. Rev. D 85 123519 (2011)
DOI : 10.1103/PhysRevD.85.123519
Preprint : arXiv:1112.3895
Langue : Anglais

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