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PreprintCC BY 4.0Zenodo

Phenomenological Note: Could Growing Dark Matter Mimic the Apparent Weakening of Dark Energy? A Critical Look at DESI DR2 Results

  • AHMED KADHIM SALIH1
  1. 1Independent Researcher, Basra, Iraq
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Abstract

This phenomenological note critically examines the recent DESI DR2 preference for dynamical dark energy with w0 ~ -0.7 and wa ~ -1.0. We argue that an apparent weakening of dark energy at low redshift could be mimicked by growing dark matter or interacting dark sector models, rather than a true phantom crossing. Using the CPL parameterization w(a) = w0 + wa(1-a), we discuss how growth of structure and background expansion degeneracies can lead to misinterpretation of DESI results. We call for joint analysis with growth rate data to break the degeneracy.

Keywords: Dark Energy, DESI, Growing Dark Matter, CPL, Cosmology

ORCID: 0009-0008-9786-4695

Independent Researcher, Basra, Iraq

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Cite

BibTeXRIS
BibTeX
@misc{salih2026phenomenological,
  title = {{Phenomenological Note: Could Growing Dark Matter Mimic the Apparent Weakening of Dark Energy? A Critical Look at DESI DR2 Results}},
  author = {AHMED KADHIM SALIH},
  howpublished = {Zenodo},
  year = {2026},
  month = oct,
  doi = {10.5281/zenodo.23554465},
  url = {https://zenodo.org/records/23554465},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Phenomenological Note: Could Growing Dark Matter Mimic the Apparent Weakening of Dark Energy? A Critical Look at DESI DR2 Results
AU  - AHMED KADHIM SALIH
PY  - 2026
DA  - 2026/10/22
PB  - Zenodo
DO  - 10.5281/zenodo.23554465
UR  - https://zenodo.org/records/23554465
AB  - This phenomenological note critically examines the recent DESI DR2 preference for dynamical dark energy with w0 ~ -0.7 and wa ~ -1.0. We argue that an apparent weakening of dark energy at low redshift could be mimicked by growing dark matter or interacting dark sector models, rather than a true phantom crossing. Using the CPL parameterization w(a) = w0 + wa(1-a), we discuss how growth of structure and background expansion degeneracies can lead to misinterpretation of DESI results. We call for joint analysis with growth rate data to break the degeneracy.  Keywords: Dark Energy, DESI, Growing Dark Matter, CPL, Cosmology  ORCID: 0009-0008-9786-4695  Independent Researcher, Basra, Iraq
ER  -