Kähler moduli inflation

Joseph P. Conlon, Fernando Quevedo

Research output: Contribution to journalArticlepeer-review


We show that under general conditions there is at least one natural inflationary direction for the Kähler moduli of type-IIB flux compactifications. This requires a Calabi-Yau which has h2,1 > h1,1 > 2 and for which the structure of the scalar potential is as in the recently found exponentially large volume compactifications. We also need - although these conditions may be relaxed - at least one Kähler modulus whose only non-vanishing triple-intersection is with itself and which appears by itself in the non-perturbative superpotential. Slow-roll inflation then occurs without a fine tuning of parameters, evading the η problem of F-term inflation. In order to obtain COBE-normalised density perturbations, the stabilised volume of the Calabi-Yau must be O(105-107) in string units, and the inflationary scale Minfl ∼ 1013 GeV. We find a robust model independent prediction for the spectral index of 1-2/Ne ≤ 0.960 → 0.967, depending on the number of efoldings.

Original languageEnglish (US)
Pages (from-to)3729-3743
Number of pages15
JournalJournal of High Energy Physics
Issue number1
StatePublished - 2006


  • Cosmology of Theories beyond the SM
  • Supergravity Models
  • Superstring Vacua
  • Superstrings and Heterotic Strings

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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