Fibre inflation and α-attractors

Renata Kallosh, Andrei Linde, Diederik Roest, Alexander Westphal, Yusuke Yamada*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Fibre inflation is a specific string theory construction based on the Large Volume Scenario that produces an inflationary plateau. We outline its relation to α-attractor models for inflation, with the cosmological sector originating from certain string theory corrections leading to α = 2 and α = 1/2. Above a certain field range, the steepening effect of higher-order corrections leads first to the breakdown of single-field slow-roll and after that to the onset of 2-field dynamics: the overall volume of the extra dimensions starts to participate in the effective dynamics. Finally, we propose effective supergravity models of fibre inflation based on an D3 ¯ uplift term with a nilpotent superfield. Specific moduli dependent D3 ¯ induced geometries lead to cosmological fibre models but have in addition a de Sitter minimum exit. These supergravity models motivated by fibre inflation are relatively simple, stabilize the axions and disentangle the Hubble parameter from supersymmetry breaking.

Original languageEnglish
Article number117
JournalJournal of High Energy Physics
Issue number2
Publication statusPublished - 2018 Feb 1
Externally publishedYes


  • Cosmology of Theories beyond the SM
  • Supergravity Models

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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