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The State of the Dark Energy Equation of State

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arxiv astro-ph/0211522 v3 pith:IW5P4QWD submitted 2002-11-24 astro-ph gr-qchep-phhep-th

classification astro-phgr-qchep-phhep-th
keywords statedarkdataenergyequationhubbleparameteralthough
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abstract

By combining data from seven cosmic microwave background experiments (including the latest WMAP results) with large scale structure data, the Hubble parameter measurement from the Hubble Space Telescope and luminosity measurements of Type Ia supernovae we demonstrate the bounds on the dark energy equation of state $w_Q$ to be $-1.38< w_Q <-0.82$ at the 95% confidence level. Although our limit on $w_Q$ is improved with respect to previous analyses, cosmological data does not rule out the possibility that the equation of state parameter $w_Q$ of the dark energy $Q$ is less than -1. We present a tracking model that ensures $w_Q \le -1$ at recent times and discuss the observational consequences.

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Forward citations

Cited by 3 Pith papers

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

  1. Cosmological Evidence for Dark Axion-Dark Baryon Interactions from Apparent Phantom Crossing

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

    Dark axion–dark baryon interactions improve the fit to CMB+DESI+SNe by Δχ²=-14.5 over ΛCDM, via a non-monotonic dark-matter mass that mimics phantom crossing, while leaving the Hubble tension unresolved.

  2. The Nature of Phantom Dark Energy and its Relation to Time Crystals

    hep-th 2025-02 reject novelty 5.0 of 10

    Phantom dark energy is claimed to be, at its fundamental level, a fluid of time crystals, with the same non-canonical kinetic conditions producing both.

  3. Dark Energy from Time Crystals

    hep-ph 2025-02 conditional novelty 5.0 of 10

    A time-crystal scalar field is shown to satisfy the phantom dark energy conditions w < -1, c_s^2 > 0, and rho >= 0 inside the crystal region.

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