Effective Field Theory for Inflation

Details Effective Field Theory for Inflation Effective Field Theory for Inflation

2008-04-27

arxiv.org/abs/0804.4291v2

Phys.Rev.D77:123541,2008

Physics

High Energy Physics

High Energy Physics - Theory

14 pages, Latex, references added and minor additions and corrections made

Scientific paper

10.1103/PhysRevD.77.123541

The methods of effective field theory are used to study generic theories of inflation with a single inflaton field. For scalar modes, the leading corrections to the ${\cal R}$ correlation function are found to be purely of the $k$-inflation type. For tensor modes the leading corrections to the correlation function arise from terms in the action that are quadratic in the curvature, including a parity-violating term that makes the propagation of these modes depend on their helicity. These methods are also briefly applied to non-generic theories of inflation with an extra shift symmetry, as in so-called ghost inflation.

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