Systematics of multi-field effects at the end of warped brane inflation

Abstract

We investigate in the context of brane inflation the possibility of additional light scalar fields generating significant power spectrum and non-Gaussianities at the end of inflation affecting the CMB scale observations. We consider the specific mechanism outlined by Lyth and describe the necessary criteria for it to be potentially important in a warped throat. We also discuss different mechanisms for uplifting the vacuum energy which can lead to different dominant contributions of the inflaton potential near the end of inflation. We then apply such criteria to one of the most detailed brane inflation models to date, and show that inflation can persist towards the tip of the throat, however for the specific stable inflationary trajectory, the light residual isometry direction becomes degenerate. We also estimate the effects for other inflationary trajectories with non-degenerate residual isometries.

arXiv comment(v1) 42 pages, 2 figures; (v2) typos corrected, more clarifications added, 1 reference added, to appear in JHEP; (v3) matched with JHEP version

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• The hybrid inflation waterfall and the primordial curvature perturbation
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• Combined local and equilateral non-Gaussianities from multifield DBI inflation
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• The Trispectrum in the Multi-brid Inflation
• Inflation on an Open Racetrack
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• How Delicate is Brane-Antibrane Inflation?
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• Curvatons in Warped Throats
• Spinflation with Angular Potentials
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• Spinflation with backreaction