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Journal of Cosmology and Astroparticle Physics 12 (2011) 019
Inflation and primordial non-Gaussianities of "generalized Galileons"
X. Gao1, D.A. Steer1
(2011-12)

We set up cosmological perturbation theory and study the cosmological implications of the so-called "generalized Galileon" developed in [6, 7]. This is the most general scalar field theory whose Lagrangian contains derivatives up to second order while keeping second order equations of motion, and contains as sub-cases k-inflation, G-inflation and many other models. We calculate the power spectrum of the primordial curvature perturbation, finding a modification of the usual consistency relation of the tensor-to-scalar ratio in k-inflation or perfect fluid models. Finally we also calculate the bispectrum, which contains no new shapes beyond those of k-inflation.
1:  APC - UMR 7164 - AstroParticule et Cosmologie
APC - THEORIE
Physics/High Energy Physics - Theory
Fulltext link: 
http://fr.arXiv.org/abs/1107.2642