Emergent Dark Energy from Dark Matter

Abstract

We consider the cosmological dynamics of a scalar field in a potential with multiple troughs and peaks. We show that the dynamics of the scalar field will evolve from light dark matter-like behaviour (such as that of a light axion) to a combination of heavy dark matter-like and dark energy-like behaviour. We discuss the phenomenology of such a model, explaining how it can give rise to the cosmological constant, as well as how it can decouple the dark sector densities between the time of recombination and today, for both the homogeneous background and perturbations. The final form of the dark matter is axion-like, but with abundance and primordial isocurvature modes taking very different values from traditional, axionic, dark matter.

5 pages, 3 figures; v2: published in PRD

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Cited by in corpus (7)

• Novel constraints on non-cold (non-thermal) Dark Matter from Lyman-$\alpha$ forest data
• Ginzburg-Landau Theory of Dark Energy: A Framework to Study Both Temporal and Spatial Cosmological Tensions Simultaneously
• Late time transitions in the quintessence field and the $H_0$ tension
• Foamy Dark Matter from Monodromies
• Unified $f(R)$ gravity at local scales
• The Super-Planckian Axion Strikes Back
• Bubble Nucleation from Boson Star Collapse