MG12 - Talk detail
 

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Abstract

Multifield cosmological perturbations at third order and the ekpyrotic trispectrum.

We derive the equations of motion for adiabatic and entropy perturbations at third order in perturbation theory for cosmological models involving two scalar fields. We use these equations to calculate the trispectrum of ekpyrotic and cyclic models in which the density perturbations are generated via the entropic mechanism. In these models, the conversion of entropy into curvature perturbations occurs just before the big bang, either during the ekpyrotic phase or during the subsequent kinetic energy dominated phase. In both cases, we find that the non-linearity parameters f_{NL} and g_{NL} combine to leave a very distinct observational imprint.

Multifield inflation with non-standard kinetic terms

We study multiple field inflation models with non-standard kinetic terms, and in particular multifield Dirac-Born-Infeld inflation. We study their observational consequences and pay special attention to their non-Gaussian properties.

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