Sustainability of multi-field inflation and bound on string scale

Details Sustainability of multi-field inflation and bound on string scale Sustainability of multi-field inflation and bound on string scale

2007-08-15

arxiv.org/abs/0708.2045v3

Physics

High Energy Physics

High Energy Physics - Theory

(v1) 9 pages, 1 figure;(v2) 10 pages, references added; (v3) 15 pages, 4 figures, more discussions about parameters and observ

Scientific paper

We study the effects of the interaction terms between the inflaton fields on the inflationary dynamics in multi-field models. With power law type potential and interactions, the total number of e-folds may get considerably reduced and can lead to unacceptably short period of inflation. Also we point out that this can place a bound on the characteristic scale of the underlying theory such as string theory. Using a simple multi-field chaotic inflation model from string theory, the string scale is constrained to be larger than the scale of grand unified theory.

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