Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 7, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2013/07/020
Keywords
modified gravity; cosmological perturbation theory; inflation; non-gaussianity
Funding
- European Research Council under the European Union's Seventh Framework Programme (FP7) / ERC Grant [306425]
- Marie Curie Career Integration Grant LIMITSOFGR-TPS Grant [303537]
- European Research Council under the European Union's Seventh Framework Programme (FP7) / ERC Grant [306425]
- Marie Curie Career Integration Grant LIMITSOFGR-TPS Grant [303537]
- Science and Technology Facilities Council [ST/J000388/1] Funding Source: researchfish
- STFC [ST/J000388/1] Funding Source: UKRI
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We develop the gradient expansion formalism for shift-symmetric Galileon-type actions. We focus on backgrounds that undergo inflation, work in the synchronous gauge, and obtain a general solution up to second order without imposing extra conditions at first order. The solution simplifies during the late stages of inflation. We also define a curvature perturbation conserved up to first order.
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