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the claim

Alternative dark energy theories allow the equation of state parameter w to differ from -1

the verdict
SUPPORTED
the evidence backs this
Recorded sources
6 sources for · 0 against

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Alternative dark energy frameworks, such as quintessence, quintom, and alpha-attractor models, explicitly permit the dark energy equation of state parameter w to deviate from the cosmological constant value of -1.

The analysis

Multiple theoretical and observational studies confirm that alternative dark energy models accommodate an equation of state parameter w that differs from -1, aligning with recent observational hints from datasets like DESI.

Evidence for · 6
Dark energy, α-attractors, and large-scale structure surveys
Recorded source metadata

Yashar Akrami, R. Kallosh, Andrei Linde, V. Vardanyan. Dark energy, α-attractors, and large-scale structure surveys. 2017. https://doi.org/10.1088/1475-7516/2018/06/041

The paper discusses alpha-attractor models with dynamical dark energy where certain models feature an equation of state w different from -1.

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More for · 5
Interpreting DESI 2024 BAO: Late-time dynamical dark energy or a local effect?
Recorded source metadata

I. Gialamas, G. Hütsi, K. Kannike, A. Racioppi, Martti Raidal, Martin Vasar, H. Veermäe. Interpreting DESI 2024 BAO: Late-time dynamical dark energy or a local effect?. 2024. https://doi.org/10.1103/PhysRevD.111.043540

The paper notes that physical quintessence models fit data well and model-independently explore deviations from w = -1.

Observational Constraints on Dynamical Dark Energy with Pivoting Redshift
Recorded source metadata

Weiqiang Yang, S. Pan, E. D. Valentino, E. Saridakis. Observational Constraints on Dynamical Dark Energy with Pivoting Redshift. 2018. https://doi.org/10.3390/universe5110219

The paper investigates generalized parametrizations where the dark energy equation of state parameter varies.

Observational challenges to holographic and Ricci dark energy paradigms: Insights from ACT DR6 and DESI DR2
Recorded source metadata

Peng-Ju 鹏举 Wu 武, T. Li 李, Guo-Hong 国宏 Du 杜, X. Zhang 张. Observational challenges to holographic and Ricci dark energy paradigms: Insights from ACT DR6 and DESI DR2. 2025. https://doi.org/10.1088/1674-1137/ae3be2

The paper examines dynamical dark energy models like holographic and Ricci dark energy where the equation of state evolves away from a cosmological constant.

Early dark energy beyond slow-roll: Implications for cosmic tensions
Recorded source metadata

Ravi Kumar Sharma, Subinoy Das, V. Poulin. Early dark energy beyond slow-roll: Implications for cosmic tensions. 2023. https://doi.org/10.1103/physrevd.109.043530

The paper explores early dark energy models allowing for an equation of state w differing from -1.

The quintom theory of dark energy after DESI DR2.
Recorded source metadata

Cai Y, Ren X, Qiu T, Li M, Zhang X. The quintom theory of dark energy after DESI DR2.. 2026. https://doi.org/10.1093/nsr/nwag115

The paper reviews quintom cosmology and dynamical dark energy models where the equation of state parameter evolves across w = -1.

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first checked01 Aug 2026
judged → SUPPORTED · 8901 Aug 2026
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