Inflation and primordial non-Gaussianities of 'generalized Galileons'

Journal Article · Thu Dec 01 00:00:00 EST 2011 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2011/12/019· OSTI ID:22279715

Gao, Xian

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.

• OSTI ID: 22279715
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2011, Issue 12; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COSMOLOGICAL MODELS
COSMOLOGY
EQUATIONS OF MOTION
INFLATONS
LAGRANGIAN FUNCTION
PERTURBATION THEORY
SCALAR FIELDS
TENSORS