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The state of the dark energy equation of state circa 2023

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arxiv 2307.14802 v2 pith:2Y6XJ6RU submitted 2023-07-27 astro-ph.CO gr-qchep-phhep-th

Luis A. Escamilla , William Giarè , Eleonora Di Valentino , Rafael C. Nunes , Sunny Vagnozzi This is my paper
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abstract

We critically examine the state of current constraints on the dark energy (DE) equation of state (EoS) $w$. Our study is motivated by the observation that, while broadly consistent with the cosmological constant value $w=-1$, several independent probes appear to point towards a slightly phantom EoS ($w \sim -1.03$) which, if confirmed, could have important implications for the Hubble tension. We pay attention to the apparent preference for phantom DE from Planck Cosmic Microwave Background (CMB) data alone, whose origin we study in detail and attribute to a wide range of (physical and geometrical) effects. We deem the combination of Planck CMB, Baryon Acoustic Oscillations, Type Ia Supernovae, and Cosmic Chronometers data to be particularly trustworthy, inferring from this final consensus dataset $w=-1.013^{+0.038}_{-0.043}$, in excellent agreement with the cosmological constant value. Overall, despite a few scattered hints, we find no compelling evidence forcing us away from the cosmological constant (yet).

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Cited by 6 Pith papers

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

  1. Hubble tension: the shape wall

    astro-ph.CO 2026-07 accept novelty 6.0 of 10

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  2. BAO miscalibration cannot rescue late-time solutions to the Hubble tension

    astro-ph.CO 2025-10 accept novelty 6.0 of 10

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  4. Pad\'e Approximants for cosmic Dispersion Measures

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  5. Stability and Thermodynamics of a Generalized Power-Law Dark Energy Model

    gr-qc 2025-07 conditional novelty 3.0 of 10

    A generalized power-law dark energy model, combining a linear pressure term with a power-law correction, admits a stable phantom-like accelerating attractor and satisfies the generalized second law precisely when the ...

  6. Beyond LambdaCDM: How the Hubble tension challenges early universe physics

    astro-ph.CO 2025-07 reject novelty 2.0 of 10

    An Early Dark Energy model can fit H0=73.56 km/s/Mpc only with a high EDE fraction and high peak redshift, while Bayesian evidence favors the model only in a narrow, finely-tuned parameter space.

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