Hybrid inflation and waterfall field in string theory from D7-branes

Abstract

We present an explicit string realisation of a cosmological inflationary scenario we proposed recently within the framework of type IIB flux compactifications in the presence of three magnetised D7-brane stacks. Inflation takes place around a metastable de Sitter vacuum. The inflaton is identified with the volume modulus and has a potential with a very shallow minimum near the maximum. Inflation ends due to the presence of "waterfall" fields that drive the evolution of the Universe from a nearby saddle point towards a global minimum with tuneable vacuum energy describing the present state of our Universe.

arXiv comment41 pages, 3 figures. v2: published version, added precisions on transverse moduli masses on p.24 + solved issue with tables aspect + minor corrections

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• Chiral global embedding of Fibre Inflation with $\overline{D3}$ uplift
• Inflating in perturbative LVS: Global Embedding and Robustness
• Seeking de-Sitter Vacua in the String Landscape
• Flux vacua in type IIB compactifications on orbifolds: their finiteness and minimal string coupling
• Assisted Fibre Inflation in Perturbative LVS
• Hybrid Inflation, Reheating and Dark Radiation in a IIB perturbative moduli stabilization scenario
• Supersymmetric Horizons at the Edge of Effective Field Theory
• Hybrid inflation from supersymmetry breaking