PIRSA:26040073 Conference Cosmology

DOI10.48660/26040073

Conference/School: Cosmological Frontiers in Fundamental Physics 2026

Weiner, Z. (2026). The matter-era distance excess. Perimeter Institute. https://pirsa.org/26040073

Weiner, Zach. The matter-era distance excess. Perimeter Institute, Apr. 29, 2026, https://pirsa.org/26040073 

@misc{ pirsa_PIRSA:26040073,
  doi = {10.48660/26040073},
  url = {https://pirsa.org/26040073},
  author = {Weiner, Zach},
  keywords = {Cosmology},
  language = {en},
  title = {The matter-era distance excess},
  publisher = {Perimeter Institute},
  year = {2026},
  month = {apr},
  note = {PIRSA:26040073 see, \url{https://pirsa.org}}
}

Abstract

Observations of the cosmic microwave background and galaxy clustering are putting increasing pressure on the standard cosmological model, with surprising implications for massive neutrinos, dark energy, and nonminimal dark sectors more generally. I will present a general description of the tension between the CMB and baryon acoustic oscillation data that provides a unified, physical, and analytically interpretable explanation for its cosmological consequences. As a corollary, I will show that the CMB's contribution to dynamical dark energy preferences derives uniquely from the (a priori unphysical) extrapolation of the fitted equation of state to high redshift. I will present several microphysically grounded alternatives that remove this evidence and identify the physical feature underlying the remaining preference for dark energy dynamics.

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