Power-counting and the Validity of the Classical Approximation During Inflation

Details Power-counting and the Validity of the Classical Approximation During Inflation Power-counting and the Validity of the Classical Approximation During Inflation

2009-02-25

arxiv.org/abs/0902.4465v3

JHEP 0909:103,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages V3, final JHEP version, R^2 discussion extended

Scientific paper

10.1088/1126-6708/2009/09/103

We use the power-counting formalism of effective field theory to study the size of loop corrections in theories of slow-roll inflation, with the aim of more precisely identifying the limits of validity of the usual classical inflationary treatments. We keep our analysis as general as possible in order to systematically identify the most important corrections to the classical inflaton dynamics. Although most slow-roll models lie within the semiclassical domain, we find the consistency of the Higgs-Inflaton scenario to be more delicate due to the proximity between the Hubble scale during inflation and the upper bound allowed by unitarity on the new-physics scale associated with the breakdown of the semiclassical approximation within the effective theory. Similar remarks apply to curvature-squared inflationary models.

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