Out of the Swampland with Multifield Quintessence?

Abstract

Multifield models with a curved field space have already been shown to be able to provide viable quintessence models for steep potentials that satisfy swampland bounds. The simplest dynamical systems of this type are obtained by coupling Einstein gravity to two scalar fields with a curved field space. In this paper we study the stability properties of the non-trivial fixed points of this dynamical system for a general functional dependence of the kinetic coupling function and the scalar potential. We find the existence of non-geodesic trajectories with a sharp turning rate in field space which can give rise to late-time cosmic acceleration with no need for flat potentials. In particular, we discuss the properties of the phase diagram of the system and the corresponding time evolution when varying the functional dependence of the kinetic coupling. Interestingly, upon properly tuning the initial conditions of the field values, we find trajectories that can describe the current state of the universe. This could represent a promising avenue to build viable quintessence models out of the swampland if they could be consistently embedded in explicit string constructions.

16 pages, 6 figures; typos corrected and references added

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• Dark Energy from Inspiraling in Field Space
• To curve, or not to curve: Is curvature-assisted quintessence observationally viable?
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• Dark energy with the help of interacting dark sectors
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• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• Effect of Moduli Redefinitions on Fibre Inflation
• Implications of single field inflation in general cosmological scenarios on the nature of dark energy given the swampland conjectures
• Stringy multifield quintessence and the Swampland
• Anisotropic Spacetimes in Chiral Scalar Field Cosmology
• Towards a de Sitter quintom-like cosmology from a reduction of a 7-dimensional $BF$ theory