Abstract
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 \( \overline{D3} \) uplift term with a nilpotent superfield. Specific moduli dependent \( \overline{D3} \) 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.
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Kallosh, R., Linde, A., Roest, D. et al. Fibre inflation and α-attractors. J. High Energ. Phys. 2018, 117 (2018). https://doi.org/10.1007/JHEP02(2018)117
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DOI: https://doi.org/10.1007/JHEP02(2018)117