Publication : t10/038

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

Bernardeau F. (CEA, IPhT (Institut de Physique Théorique), F-91191 Gif-sur-Yvette, France)
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.
Année de publication : 2010
Revue : Class. Quantum Grav. 27 124004 (2010)
DOI : 10.1088/0264-9381/27/12/124004
Preprint : arXiv:1003.2869
Keywords : Cosmologie, inflation
Langue : Anglais

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  • 0264-9381_27_12_124004.pdf
  • publi.pdf


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