Galileon inflation
arXiv:1009.2497 · doi:10.1088/1475-7516/2011/01/014
Abstract
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.
13 pages, plus appendices and references. v2: some clarifications in introduction; missing references added. v3: discussion of Sec. IV.B clarified. Matches version published in JCAP. v4: typos corrected in (44)-(47). v5: some improvements to IV.B; sign error fixed in h4 term of (B25) and related numerical error in (47)
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Cited by in corpus (9)
- Higgs G-inflation
- Symmetries for Galileons and DBI scalars on curved space
- Matter perturbations in Galileon cosmology
- Primordial non-Gaussianities in general modified gravitational models of inflation
- General Embedded Brane Effective Field Theories
- Primordial non-Gaussianity from G-inflation
- A note on the role of the boundary terms for the non-Gaussianity in general k-inflation
- Resonant Trispectrum and a Dozen More Primordial N-point functions
- Instabilities of Spherical Solutions with Multiple Galileons and SO(N) Symmetry