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Evolving Dark Energy or Evolving Dark Matter?
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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.
Forward citations
Cited by 11 Pith papers
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General Relativistic Entropic Acceleration at the perturbation level: a CLASS implementation and first Boltzmann-code constraints
First full Boltzmann-code implementation of entropic dark energy, with MCMC constraints from CMB+BAO+SN, yields α≈1 and a fit statistically indistinguishable from ΛCDM.
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Signatures of Modified Gravity on Linear Scales in a Dynamical Dark Energy Background
Using Planck, DESI, supernovae, and redshift-space distortions, the authors infer that modified gravity, if present, must act only below ~30 Mpc and cannot modify the large scales previously considered.
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Accelerating scaling solutions from dark matter particle creation
Accelerating scaling attractors without dark energy appear only when the interaction is controlled by DM density and energy flows from DM to a barotropic fluid.
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Model-independent late-universe measurements of $H_0$ and $\Omega_K$ with the parametrization based on cosmic age-improved inverse distance ladder
A cosmic-age-based inverse distance ladder with DESI DR2, DESY5, SGL, CC and GRB data gives H0=71.59±0.94 km/s/Mpc and ΩK=0.001±0.038.
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Exploring non-cold dark matter in a scenario of dynamical dark energy with DESI DR2 data
Using DESI DR2, Planck, and supernova data, a nonzero dark matter equation of state is preferred at 2.8 to 3.3 sigma only when dark energy is assumed to have a constant equation of state.
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Neutrino mass constraints in the Schwarzschild-de Sitter black-hole dark energy model with ACT DR6 and DESI DR2 data
SdSDE dark energy yields a ~0.16–0.21 eV positive neutrino-mass preference with DESI+ACT data, but χ² strongly favors extended ΛCDM and the shift is likely compensation.
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Hermitian formulation for mass dimension one fermions: Flat and curved space-times
A Hermitian, one-loop-renormalizable derivative Higgs portal for Elko dark matter is presented, along with a path-integral route toward a curved-space completion.
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Alleviating the $H_0$ tension through the interacting dark energy model from quantum gravitational field theory in light of DESI DR2
With DESI DR2 BAO plus CMB and a SH0ES prior, the two-parameter eeΛCDM model gives δΛ=-0.41±0.14 and H0=71.9±1.0, easing the Hubble tension to 0.8σ, but SN datasets erase the signal.
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Cosmological preference for a positive neutrino mass at 2.7$\sigma$: A joint analysis of DESI DR2, DESY5, and DESY1 data
A joint fit of DESI DR2, CMB, DESY5 and DESY1 data gives total neutrino mass 0.098 (+0.016, -0.037) eV, a 2.7 sigma preference for positive mass in the w0waCDM model.
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ACT DR6 Leads to Stronger Evidence for Dynamical Dark Matter
A joint analysis of ACT DR6, DESI DR2 BAO and DESY5 supernovae finds a 3.4σ preference for dark matter with an evolving equation of state, but the significance is sensitive to model choice and data selection.
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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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