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Dynamical dark energy from an ultralight axion
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abstract
Recently the Dark Energy Survey (DES) Collaboration presented evidence that the equation of state $w$ of the dark energy is varying, or $w \simeq -0.948$ if it is constant. In either case, the dark energy cannot be due to a cosmological constant alone. Here we study an ultralight axion (or axion-like particle) with mass $m_\phi \simeq 2 \times 10^{-33}$ eV that has properties that can explain the new $w$ measurement. In particular, $w\ge -1$ and a negative cosmological constant $\Lambda < 0$ is preferred in this model. We also present a simple formula for $w$ for the model to ease data fitting.
Forward citations
Cited by 4 Pith papers
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ALAverse: A falsifiable anthropic model from the string landscape
Anthropically selected string axion plus negative vacuum energy predicts a ~40% chance of the observed matter/dark-energy balance and an accelerating-thawing dark energy that current CMB+BAO+SN data prefer over ΛCDM at 2.7σ.
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The Status of Single Scalar Field Dark Energy
Cosmological data can constrain only a handful of EFT parameters for single-scalar dark energy; extended models show modest preference over Λ but remain underdetermined and challenged by fifth forces and screening.
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The Lifespan of our Universe
If the axion dark energy model with a negative cosmological constant is the true explanation of DES/DESI data, the universe will end in a big crunch at a total age of about 33 billion years.
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Topological defects as effective dynamical dark energy
A few percent domain-wall component gives a mild (Δχ² = -1.72) improvement over ΛCDM when fitting DESI DR2 BAO and DESY5 supernovae, but the evidence is inconclusive.
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