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Generating the curvature perturbation at the end of inflation in string theory

Research output: Contribution to journalJournal article

Published
<mark>Journal publication date</mark>2006
<mark>Journal</mark>Physical Review Letters
Issue number121301
Volume97
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

In brane inflationary scenarios, the cosmological perturbations are supposed to originate from the vacuum fluctuations of the inflaton field corresponding to the position of the brane. We show that a significant, and possibly dominant, contribution to the curvature perturbation is generated at the end of inflation through the vacuum fluctuations of fields, other than the inflaton, which are light during the inflationary trajectory and become heavy at the brane-antibrane annihilation. These fields appear generically in string compactifications where the background geometry has exact or approximate isometries and parametrize the internal angular directions of the brane.