Local non-Gaussianities at third order in multifield models and the ekpyrotic trispectrum
Cosmology and Nongalactic Astrophysics
2010-04-22 v1 High Energy Physics - Theory
Abstract
We explain the motivation and main results of our work in reference arXiv:0906.0530 [hep-th]. Using the covariant formalism, we derive the equations of motion for adiabatic and entropy perturbations at third order in perturbation theory for cosmological models involving two scalar fields, and use these equations to calculate the trispectrum of ekpyrotic and cyclic models. The non-linearity parameters and are found to combine to leave a very distinct observational imprint.
Cite
@article{arxiv.1004.3688,
title = {Local non-Gaussianities at third order in multifield models and the ekpyrotic trispectrum},
author = {Sebastien Renaux-Petel},
journal= {arXiv preprint arXiv:1004.3688},
year = {2010}
}
Comments
3 pages; to appear in the Proceedings of the 12th Marcel Grossman Meeting, 13--18 July 2009, Paris, France.