Two-field axion inflation and the swampland constraint in the flux-scaling scenario

Abstract

Based on the flux-scaling scenario we study a model consisting on Type IIB string theory compactified on a Calabi-Yau manifold with a frozen complex structure in the presence of generic fluxes. The model contains (meta)stable Minkowski and de Sitter vacua as well as inflationary directions driven by two independent linear combination of axions. Due to a numerical control by fluxes, we show that cosmological parameters as the spectral index, tensor-to-scalar ratio and non-Gaussianities can be kept within observed bounds while preserving the desired hierarchies on physical scales. Moreover we compute the deviation of the inflationary trajectories from geodesics on field space in terms of the fluxes showing that for some regions, they fulfill the recent proposed swampland criterion for multi-field scenarios.

arXiv comment24 pages, 6 figures. (v2): Typos corrected, References added. (v3) Some comments, one figure and references added. Version accepted for publication in Fortschritte der Physik

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• The Swampland: Introduction and Review
• The zoo plot meets the swampland: mutual (in)consistency of single-field inflation, string conjectures, and cosmological data
• Cosmological window onto the string axiverse and the supersymmetry breaking scale
• Bounds on Slow Roll at the Boundary of the Landscape
• Weakly Coupled de Sitter Vacua with Fluxes and the Swampland
• Phenomenological Consequences of the Refined Swampland Conjecture
• Scaling limits of dS vacua and the swampland
• Hyperbolic field space and swampland conjecture for DBI scalar
• What does Inflation say about Dark Energy given the Swampland Conjectures?
• Multi-field Inflation in High-Slope Potentials
• Eternal Inflation, Entropy Bounds and the Swampland
• Reheating Constraints on Inflaton, Dark Matter: Swampland Conjecture
• Rigid nongeometric orientifolds and the swampland
• Constraints on dark energy models from the Horndeski theory
• $T$-dualizing the de-Sitter no-go scenarios
• Constraints on cosmological parameters in light of the scalar-tensor theory of gravity and swampland conjectures
• Swampland conjectures and single field inflation in non-standard cosmological scenarios
• Taxonomy of scalar potential with U-dual fluxes
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• Escape from the swamp with spectator
• Systematic exploration of the non-geometric flux landscape