Observing Brane Inflation

Details Observing Brane Inflation Observing Brane Inflation

2006-01-16

arxiv.org/abs/hep-th/0601099v2

JCAP0605:007,2006

Physics

High Energy Physics

High Energy Physics - Theory

31 pages, 12 figures; typo corrected

Scientific paper

10.1088/1475-7516/2006/05/007

Linking the slow-roll scenario and the Dirac-Born-Infeld scenario of ultra-relativistic roll (where, thanks to the warp factor, the inflaton moves slowly even with an ultra-relativistic Lorentz factor), we find that the KKLMMT D3/anti-D3 brane inflation is robust, that is, enough e-folds of inflation is quite generic in the parameter space of the model. We show that the intermediate regime of relativistic roll can be quite interesting observationally. Introducing appropriate inflationary parameters, we explore the parameter space and give the constraints and predictions for the cosmological observables in this scenario. Among other properties, this scenario allows the saturation of the present observational bound of either the tensor/scalar ratio r (in the intermediate regime) or the non-Gaussianity f_NL (in the ultra-relativistic regime), but not both.

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