Monodromy in the CMB: Gravity Waves and String Inflation

Details Monodromy in the CMB: Gravity Waves and String Inflation Monodromy in the CMB: Gravity Waves and String Inflation

2008-03-21

arxiv.org/abs/0803.3085v2

Phys.Rev.D78:106003,2008

Physics

High Energy Physics

High Energy Physics - Theory

43 pages, latex. 4 figures

Scientific paper

10.1103/PhysRevD.78.106003

We present a simple mechanism for obtaining large-field inflation, and hence a gravitational wave signature, from string theory compactified on twisted tori. For Nil manifolds, we obtain a leading inflationary potential proportional to phi^(2/3) in terms of the canonically normalized field phi, yielding predictions for the tilt of the power spectrum and the tensor-to-scalar ratio, $n_s\approx 0.98$ and $r\approx 0.04$ with 60 e-foldings of inflation; we note also the possibility of a variant with a candidate inflaton potential proportional to phi^(2/5). The basic mechanism involved in extending the field range -- monodromy in D-branes as they move in circles on the manifold -- arises in a more general class of compactifications, though our methods for controlling the corrections to the slow-roll parameters require additional symmetries.

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