articlePhysical review. D/Physical review. D.Apr 3, 2025GREEN OA

Cosmological preference for a negative neutrino mass

DGDaniel GreenJMJoel Meyers

University of California System · Southern Methodist University

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Abstract

The most precise determination of the sum of neutrino masses from cosmological data, derived from analysis of the cosmic microwave background (CMB) and baryon acoustic oscillations (BAO) from the Dark Energy Spectroscopic Instrument (DESI), favors a value below the minimum inferred from neutrino flavor oscillation experiments. We explore which data are most responsible for this puzzling aspect of the current constraints on neutrino mass and whether they are related to other anomalies in cosmology. We demonstrate conclusively that the preference for negative neutrino masses is a consequence of larger-than-expected lensing of the CMB in both the two- and four-point lensing statistics. Furthermore, we show that…

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Topics & keywords

Topics
Keywords
  • Neutrino
  • Preference
  • Particle physics
  • Physics
  • Psychology
  • Mathematics
  • Statistics
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