Swampland de Sitter Conjectures in No-Scale Supergravity Models

Abstract

It is challenging to construct explicit and controllable models that realize de Sitter solutions in string compactifications. This difficulty is the main motivation for the Refined de Sitter Conjecture and the Trans-Planckian Censorship Conjecture which forbid stable de Sitter solutions but allow metastable, unstable and rolling solutions in a theory consistent with quantum gravity. Inspired by this, we first study a toy de Sitter No-Scale Supergravity model and show that for particular choices of parameters it can be consistent with the Refined de Sitter Conjecture and the Trans-Planckian Censorship Conjecture. Then we modify the model by adding rolling dynamics and show that the theory can become stable along the imaginary direction, where it would otherwise be unstable. We extend the model to multi-field rolling and de Sitter fields, finding the parameter space where they can be compatible with the Refined de Sitter Conjecture . The modified models with rolling fields can be used to construct Quintessence models to accommodate the accelerating expansion of the Universe.

18 pages, 4 figures. Updated with version matching the published version. References added and minor typos corrected

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• Inflection-Point Sgoldstino Inflation in no-Scale Supergravity
• From Minkowski to de Sitter Vacua with Various Geometries
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• Higgs in Nilpotent Supergravity: Vacuum Energy and Festina Lente
• Starobinsky Inflation with T-Model Kaehler Geometries