Model-Independent Perspectives on Coupled Dark Energy and the Swampland

Abstract

We present a general model-independent approach to study the coupled dark energy and the string Swampland criteria. We show how the dark sector interaction is degenerated with the equation of state of dark energy in the context of the expansion of the Universe. With priors for either of them, the dynamics of dark energy and the dark sector interactions can be reconstructed together with the bounds of the Swampland criteria. Combining cosmic chronometers, baryon acoustic oscillation (BAO), and Type Ia supernovae our results suggest a mild $1\sigma$ significance of dark sector interactions at low redshift for the coupled quintessence. The Lyman-$\alpha$ BAO at $z=2.34$ leads a $2\sigma$ signal of nonzero interactions at high redshift. The implications for coupled quintessence are discussed.

7 pages, 2 figures. The PRD version

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Cited by in corpus (7)

• Gravitational-Wave Detector Networks: Standard Sirens on Cosmology and Modified Gravity Theory
• Reconstruction of the dark sectors' interaction: A model-independent inference and forecast from GW standard sirens
• Dynamical Dark Energy Implies a Coupled Dark Sector: Insights from DESI DR2 via a Data-Driven Approach
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• Gravitational wave signatures from dark sector interactions
• Interplay between Swampland and Bayesian Machine Learning in constraining cosmological models
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme