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Implications of DESI data for dark matter and cosmic birefringence

Basabendu Barman1,* and Sudhakantha Girmohanta2,3,†

  • *Contact author: basabendu.b@srmap.edu.in
  • †Contact author: sgirmohanta@sjtu.edu.cn
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Phys. Rev. D 113, 015023 – Published 20 January, 2026

DOI: https://doi.org/10.1103/169s-4g17

Abstract

We explore an interacting dark matter (DM)-dark energy (DE) framework that naturally yields an effective dynamical DE equation of state crossing the phantom barrier at early times, as indicated by recent DESI data, while also accounting for the observed isotropic rotation of the cosmic microwave background (CMB) linear polarization. Within this unified framework, we also explain the DM relic abundance without introducing additional fields or couplings. Depending on the DE potential, we identify two viable scenarios: a superheavy freeze-in DM requiring a high reheating temperature, or a strongly interacting dark sector with a GeV–TeV scale thermal DM candidate.

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Phys. Rev. D 113, 015023– Published 20 January, 2026
  • Received 1 September 2025
  • Accepted 5 January 2026
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