Gravity and non-gravity mediated couplings in multiple-field inflation

Details Gravity and non-gravity mediated couplings in multiple-field inflation Gravity and non-gravity mediated couplings in multiple-field inflation

2010-03-15

arxiv.org/abs/1003.2869v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

14 pages, 3 figures, invited review for CQG issue on non-linear cosmology

Scientific paper

Mechanisms for the generation of primordial non-Gaussian metric fluctuations in the context of multiple-field inflation are reviewed. As long as kinetic terms remain canonical, it appears that nonlinear couplings inducing non-gaussianities can be split into two types. The extension of the one-field results to multiple degrees of freedom leads to gravity mediated couplings that are ubiquitous but generally modest. Multiple-field inflation offers however the possibility of generating non-gravity mediated coupling in isocurvature directions that can eventually induce large non-Gaussianities in the metric fluctuations. The robustness of the predictions of such models is eventually examined in view of a case study derived from a high-energy physics construction.

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