IIB String Theory and Sequestered Inflation

Abstract

We develop sequestered inflation models, where inflation occurs along flat directions in supergravity models derived from type IIB string theory. It is compactified on a $\frac{{\mathbb{T}}^6}{{\mathbb{Z}}_2\times {\mathbb{Z}}_2}$ orientifold with generalized fluxes and O3/O7-planes. At Step I, we use flux potentials which 1) satisfy tadpole cancellation conditions and 2) have supersymmetric Minkowski vacua with flat direction(s). The 7 moduli are split into heavy and massless Goldstone multiplets. At Step II we add a nilpotent multiplet and uplift the flat direction(s) of the type IIB string theory to phenomenological inflationary plateau potentials: $\alpha$-attractors with 7 discrete values $3\alpha =1,2,3,...,7$. Their cosmological predictions are determined by the hyperbolic geometry inherited from string theory. The masses of the heavy fields and the volume of the extra dimensions change during inflation, but this does not affect the inflationary dynamics.

arXiv comment24pages, 7 figures, v2: reference added, accepted for publication in Fortschritte der Physik, v3: addendum after BICEP/Keck18 release added in Sec. 7

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• $\alpha$-attractor inflation: Models and predictions
• (Super)Universal Attractors and the de Sitter Vacua in String Landscape
• Complementary signatures of $\alpha -$attractor inflation in CMB and cosmic string Gravitational Waves
• Supersymmetric Horizons at the Edge of Effective Field Theory