Model-agnostic assessment of dark energy after DESI DR1 BAO
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Date
2025
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Institute of Physics
Abstract
Baryon acoustic oscillation measurements by the Dark Energy Spectroscopic Instrument (Data Release 1) have revealed exciting results that show evidence for dynamical dark energy at ∼ 3σ when combined with cosmic microwave background and type Ia supernova observations. These measurements are based on the w 0 w a CDM model of dark energy. The evidence is less in other dark energy models such as the wCDM model. In order to avoid imposing a dark energy model, we reconstruct the distance measures and the equation of the state of dark energy independent of any dark energy model and driven only by observational data. Our results show that the model-agnostic (in terms of late-time models) evidence for dynamical dark energy from DESI is not significant. Our analysis also provides model-independent constraints on cosmological parameters such as the Hubble constant and the matter-energy density parameter at present. Although we used CMB distance priors (not full CMB data) from a ΛCDM early-time model, our results remain largely similar for other cosmological models, provided that these models do not differ significantly from the standard model.
Description
Keywords
Baryon acoustic oscillations, Dark energy theory, Machine learning, CMB distance, ΛCDM early-time model
Citation
Dinda, B.R. and Maartens, R., 2025. Model-agnostic assessment of dark energy after DESI DR1 BAO. Journal of Cosmology and Astroparticle Physics, 2025(01), p.120.