Large Gravitational Waves and Lyth Bound in Multi Brane Inflation

Details Large Gravitational Waves and Lyth Bound in Multi Brane Inflation Large Gravitational Waves and Lyth Bound in Multi Brane Inflation

2007-08-31

arxiv.org/abs/0708.4414v3

JCAP 0807:001,2008

Physics

High Energy Physics

High Energy Physics - Theory

15 pages, 1 figure; v2: references added; v3: final version published in JCAP

Scientific paper

10.1088/1475-7516/2008/07/001

It is shown that multi M5-brane inflation in heterotic M-theory gives rise to a detectable gravitational wave power spectrum with tensor fraction $r$ typically larger than the projected experimental sensitivity, $r_{exp} = 0.01$. A measurable gravitational wave power spectrum entails a large inflationary energy scale and a super-Planckian inflaton variation. They present serious problems for particle theory model building resp. a reliable effective field theory description. These problems are eased or even absent in multi-brane inflation models and multi M5-brane inflation, in particular.

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