Galileon inflation

Details Galileon inflation Galileon inflation

2010-09-13

arxiv.org/abs/1009.2497v5

JCAP 1101:014,2011

Physics

High Energy Physics

High Energy Physics - Theory

13 pages, plus appendices and references. v2: some clarifications in introduction; missing references added. v3: discussion of

Scientific paper

10.1088/1475-7516/2011/01/014

Galileon inflation is a radiatively stable higher derivative model of inflation. The model is determined by a finite number of relevant operators which are protected by a covariant generalization of the Galileon shift symmetry. We show that the nongaussianity of the primordial density perturbation generated during an epoch of Galileon inflation is a particularly powerful observational probe of these models and that, when the speed of sound is small, fNL can be larger than the usual result fNL ~ 1/c_s^2.

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