Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-07-11
JHEP0809:011,2008
Physics
High Energy Physics
High Energy Physics - Theory
(v1) 42 pages, 2 figures; (v2) typos corrected, more clarifications added, 1 reference added, to appear in JHEP; (v3) matched
Scientific paper
10.1088/1126-6708/2008/09/011
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.
Chen Heng-Yu
Gong Jinn-Ouk
Shiu Gary
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