Galileon inflation
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.
Cite
@article{arxiv.1009.2497,
title = {Galileon inflation},
author = {Clare Burrage and Claudia de Rham and David Seery and Andrew J. Tolley},
journal= {arXiv preprint arXiv:1009.2497},
year = {2011}
}
Comments
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)