Local non-Gaussianities at third order in multifield models and the ekpyrotic trispectrum

Details Local non-Gaussianities at third order in multifield models and the ekpyrotic trispectrum Local non-Gaussianities at third order in multifield models and the ekpyrotic trispectrum

2010-04-21

arxiv.org/abs/1004.3688v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

3 pages; to appear in the Proceedings of the 12th Marcel Grossman Meeting, 13--18 July 2009, Paris, France.

Scientific paper

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 $f_{NL}$ and $g_{NL}$ are found to combine to leave a very distinct observational imprint.

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