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

Heng Yu Chen, Jinn Ouk Gong, Gary Shiu

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23 Scopus citations

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.

Original languageEnglish
Article number011
JournalJournal of High Energy Physics
Volume2008
Issue number9
DOIs
StatePublished - 1 Sep 2008

Keywords

  • Cosmology of theories beyond the SM
  • D-branes
  • DS vacua in string theory

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