A new light on the darkest corner of the landscape

Abstract

Motivated by the recently proposed bounds on the slow-roll parameters for scalar potentials arising from string/M-theory compactifications, a.k.a. the Refined de Sitter Swampland conjecture, we explore the sharpness of such constraints within 4D supergravities coming from compactifications of massive type IIA string theory on ${\mathbb{T}}^6/({\mathbb{Z}}_2\times {\mathbb{Z}}_2)$. With the aid of a numerical technique, known as differential evolution, we are able to find a de Sitter extremum which is fully metastable up to one single flat direction. This solution is supported by spacetime filling sources such as O6 planes and KK monopoles. Our example violates the bound imposed by this conjecture.

13 pages, 2 figures, 6 tables

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• de Sitter Minima from M theory and String theory
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• Hidden Sectors in String Theory: Kinetic Mixings, Fifth Forces and Quintessence
• Enhancement of axion decay constants in type IIA theory?