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Article Dans Une Revue Physical Review D Année : 2022

Cosmological dynamics of multifield dark energy

Résumé

We numerically and analytically explore the background cosmological dynamics of multifield dark energy with highly nongeodesic or “spinning” field-space trajectories. These extensions of standard single-field quintessence possess appealing theoretical features and observable differences from the cosmological standard model. At the level of the cosmological background, we perform a phase-space analysis and identify approximate attractors with late-time acceleration for a wide range of initial conditions. Focusing on two classes of field-space geometry, we derive bounds on parameter space by demanding viable late-time acceleration and the absence of gradient instabilities, as well as from the de Sitter swampland conjecture.

Dates et versions

hal-03559649 , version 1 (07-02-2022)

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Johannes R. Eskilt, Yashar Akrami, Adam R. Solomon, Valeri Vardanyan. Cosmological dynamics of multifield dark energy. Physical Review D, 2022, 106 (2), pp.023512. ⟨10.1103/PhysRevD.106.023512⟩. ⟨hal-03559649⟩
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