Evolving Dark Energy or Evolving Dark Matter?

Abstract

We show that the latest empirical constraints on cosmology, from a combination of DESI, CMB and supernova data, can be accounted for if a small component of dark matter has an evolving and oscillating equation of state within $-1<w<1$. From a fundamental physics perspective, this interpretation is more appealing than an evolving phantom dark energy with $w<-1$, which violates the null energy condition.

v2: 21 pages; discussions in Sec.4 and Sec.5 extended, and other minor revisions

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Cited by in corpus (13)

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• Exploring non-cold dark matter in a scenario of dynamical dark energy with DESI DR2 data
• Robust evidence for dynamical dark energy in light of DESI DR2 and joint ACT, SPT, and Planck data
• Measuring neutrino masses with joint JWST and DESI DR2 data
• DESIgning concordant distances in the age of precision cosmology: the impact of density fluctuations
• Testing the cosmic distance duality relation with baryon acoustic oscillations and supernovae data
• Revisiting the phenomenologically emergent dark energy model: is non-zero equation of state of dark matter favored by DESI DR2?
• Uncalibrated Cosmic Standards as a Robust Test on Late-Time Cosmological Models
• Dark Energy in the DESI Era: A Brief Review of Evidence, Beyond-$\Lambda$CDM Interpretations, and Tensions
• Unified dark fluid with null sound speed as an alternative to phantom dark energy
• Thawing Quintessence: Priors, evidence, and likely trajectories
• When Dark Matter Heats Up: A Model-Independent Search for Non-Cold Behavior
• Accelerating scaling solutions from dark matter particle creation