Effective Field Theory for Inflation

Details Effective Field Theory for Inflation Effective Field Theory for Inflation

2011-06-11

arxiv.org/abs/1106.2189v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Ph.D. thesis

Scientific paper

This is a version of the author's Ph.D. thesis. The methods of effective field theory are used to study generic theories of inflation with a single inflaton field and to perform a general analysis of the associated non-Gaussianities. We investigate the amplitudes and shapes of the various three and four-point correlators which are generated by different classes of single-field inflationary models. Besides the well-known results for the so called P(X,\phi) model and the ghost inflationary theories, which we recover, we point out that extrinsic curvature-generated interactions may give rise to large non-Gaussianities with distinctive features in the form of specific shape-functions (e.g. flat, orthogonal etc..) for the correlators.

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