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Is DESI Seeing Dynamical Dark Energy, or a Cosmic Glitch in Gravity?

  • Robin Y Wen
  • Lukas Tobias Hergt
  • Niayesh Afshordi
  • Douglas Scott
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Abstract

Combined baryon acoustic oscillation and cosmic microwave background data have begun to mildly favor departures from ΛCDM. This is usually framed as 2-parameter dynamical dark energy. However, a 1-parameter "cosmic glitch in gravity" model, whose cosmological gravitational coupling differs from Newton's constant as in Hořava gravity, fits at least as well. Planck+ACT+SPT and DESI~DR2 give Gcosmo/GN=0.9920±0.0025, a 3.3 σ preference for weaker cosmological gravity, robust to adding CMB lensing and supernovae. Fitted to the CMB alone, the glitch predicts DESI distances; w0waCDM does not.

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Cite

BibTeXRIS
BibTeX
@misc{wen2026desi,
  title = {{Is DESI Seeing Dynamical Dark Energy, or a Cosmic Glitch in Gravity?}},
  author = {Robin Y Wen and Lukas Tobias Hergt and Niayesh Afshordi and Douglas Scott},
  howpublished = {HAL},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.40176},
  eprint = {2609.40176},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05781926v1},
}
RIS
TY  - UNPB
TI  - Is DESI Seeing Dynamical Dark Energy, or a Cosmic Glitch in Gravity?
AU  - Robin Y Wen
AU  - Lukas Tobias Hergt
AU  - Niayesh Afshordi
AU  - Douglas Scott
PY  - 2026
DA  - 2026/09/30
PB  - HAL
DO  - 10.48550/arxiv.2609.40176
UR  - https://hal.science/hal-05781926v1
AB  - Combined baryon acoustic oscillation and cosmic microwave background data have begun to mildly favor departures from ΛCDM. This is usually framed as 2-parameter dynamical dark energy. However, a 1-parameter "cosmic glitch in gravity" model, whose cosmological gravitational coupling differs from Newton's constant as in Hořava gravity, fits at least as well. Planck+ACT+SPT and DESI~DR2 give G_cosmo/G_N=0.9920±0.0025, a 3.3 σ preference for weaker cosmological gravity, robust to adding CMB lensing and supernovae. Fitted to the CMB alone, the glitch predicts DESI distances; w_0w_aCDM does not.
ER  -