Does DESI prefer Damped Oscillating Dark Energy over Cosmological constant?
astro-ph.CO, gr-qc
Submitted: 2026-06-16
Updated: 2026-09-24
Comments: 12 pages, 6 figures, updated figures, and a theoretical section
Code: https://github.com/brinckmann/montepython_public
License: http://creativecommons.org/licenses/by/4.0/
The gist: We investigate a dark-energy equation of state governed by a damped harmonic oscillator equation, admitting underdamped, critically damped, and overdamped solutions.
Terminology
Abstract
We investigate a dark-energy equation of state governed by a damped harmonic oscillator equation, admitting underdamped, critically damped, and overdamped solutions. Confronting the model against Planck CMB, DESI BAO, BBN, Cosmic Chronometers, and three Type Ia supernova compilations, we find that the underdamped solution yields H 0 = 70.9 plus or minus 1.1 km/s/Mpc, with DESY5 and H 0 = 72.0+1.4-2.1 km/s/Mpc with Union3, reducing the tension with SH0ES to about!1.5 sigma, while Pantheon+ strongly favors a near-critically damped solution with positive w 0 and H 0 = 66.23 plus or minus 0.85 km/s/Mpc, revealing a significant systematic tension among supernova datasets. Bayesian evidence relative to CDM is inconclusive for DES and Union3 data, demonstrating that H 0 tension alleviation is achievable at no statistical cost relative to the standard model.
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