No inflation in type IIA strings on rigid Calabi-Yau spaces

Yuki Wakimoto, Sergei V. Ketov

Research output: Contribution to journalArticle


We investigate whether cosmological inflation is possible in a class of flux compactifications of type IIA strings on rigid Calabi-Yau manifolds, when all perturbative string corrections are taken into account. We confine ourselves to the universal hypermultiplet and an Abelian vector multiplet, representing matter in four dimensions. Since all axions can be stabilized by D-instantons, we choose the dilaton and a Kähler modulus as the only running scalars. Though positivity of their scalar potential can be achieved, we find that there is no slow roll (ε > 13/6), and no graceful exit because the scalar potential has the runaway behavior resulting in decompactification. We conclude that it is impossible to generate phenomenologically viable inflation in the given class of flux compactifications of type IIA strings without explicit breaking of the N = 2 local supersymmetry of the low-energy effective action.

Original languageEnglish
Article number083E02
JournalProgress of Theoretical and Experimental Physics
Issue number8
Publication statusPublished - 1 Aug 2017


ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this