Assisted Fibre Inflation in Perturbative LVS
arXiv:2506.22630 · doi:10.1088/1475-7516/2025/10/070
Abstract
We propose a multi-field fibre inflation scenario in type IIB perturbative large volume compactifications, showing that the multi-field dynamics suppresses trans-Planckian displacements of the canonical inflaton. Considering a concrete K3-fibred Calabi-Yau (CY) threefold with and having certain underlying symmetries, we show that the presence of multi-fibre moduli creates an assisted inflation scenario where multiple moduli collectively help in producing the cosmological observables consistent with the current experimental bounds. We further argue that individual field range excursions corresponding to each of the inflaton fields can be estimated as , where denotes the effective single-field inflaton range needed to generate the desired cosmological observables, and is the number of moduli assisting the multi-fibre inflation. We also present various numerical benchmark models consistently producing cosmological observables in light of the recent ACT experiments.
arXiv commentv2: 44 pages, 10 tables, 20 figures, typos fixed and references added
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