Microscopic Origin of Volume Modulus Inflation

Abstract

High-scale string inflationary models are in well-known tension with low-energy supersymmetry. A promising solution involves models where the inflaton is the volume of the extra dimensions so that the gravitino mass relaxes from large values during inflation to smaller values today. We describe a possible microscopic origin of the scalar potential of volume modulus inflation by exploiting non-perturbative effects, string loop and higher derivative perturbative corrections to the supergravity effective action together with contributions from anti-branes and charged hidden matter fields. We also analyse the relation between the size of the flux superpotential and the position of the late-time minimum and the inflection point around which inflation takes place. We perform a detailed study of the inflationary dynamics for a single modulus and a two moduli case where we also analyse the sensitivity of the cosmological observables on the choice of initial conditions.

25 pages, 8 figures

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• Early Dark Energy in Type IIB String Theory
• Starobinsky Inflation from String Theory?
• RG-Induced Modulus Stabilization: Perturbative de Sitter Vacua and Improved $D3$-$\overline{D3}$ Inflation
• Towards a complete mass spectrum of type-IIB flux vacua at large complex structure
• Chiral global embedding of Fibre Inflation with $\overline{D3}$ uplift
• A new class of de Sitter vacua in String Theory Compactifications
• On four-derivative terms in IIB Calabi-Yau orientifold reductions
• Supersymmetric Horizons at the Edge of Effective Field Theory