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Do Observations Prefer Thawing Quintessence?

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arxiv 2411.13637 v4 pith:MHPN2KZV submitted 2024-11-20 astro-ph.CO gr-qchep-phhep-th

Guillaume Payeur , Evan McDonough , Robert Brandenberger This is my paper
classification astro-ph.COgr-qchep-phhep-th
keywords quintessencethawingdarkdataenergypriorsconstantcosmological
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In light of recent observations by the Dark Energy Spectroscopic Instrument (DESI), we study evidence for thawing quintessence over a cosmological constant as dark energy, with emphasis on the effect of the choice of priors. Working with a parametrization for the equation of state parameter motivated by the theory, we analyse the DESI BAO data jointly with Planck 2018 and Pantheon+ or Dark Energy Survey supernovae data, and find a preference for thawing quintessence compared to a bare cosmological constant only if we use priors which are heavily informed by the data itself. If we extend the priors to physically better motivated ranges, the evidence for thawing quintessence disappears.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Evolving Dark Energy from the Back-Reaction of Cosmological Perturbations

    gr-qc 2026-07 conditional novelty 6.0 of 10

    Back-reaction of cosmological inhomogeneities can make an effective dark energy with a time-dependent equation of state and no phantom crossing, even for a global average.

  2. Simple quintessence models in light of DESI-BAO observations

    astro-ph.CO 2025-06 conditional novelty 6.0 of 10

    Thawing quintessence with linear or quadratic potentials is favored over LambdaCDM only when the DESY5 supernova catalog is used; with Pantheon+ or Union3 the preference is mild.

  3. Examining Quintessence Models with DESI Data

    astro-ph.CO 2025-05 conditional novelty 6.0 of 10

    NEC-obeying hilltop and exponential quintessence models give at most marginal improvement over the cosmological constant against DESI 2024 data, and the prominent k=10 hilltop 'excellent mimic' claim is an artifact of...

  4. Observational constraints on early time non-phantom behaviour of dynamical dark energy

    astro-ph.CO 2025-12 conditional novelty 4.0 of 10

    Early scaling dark energy is constrained to be less than about one percent at matter-radiation equality and is disfavored by model selection, while late-time CPL dynamics show only a weak preference away from ΛCDM.

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