Mass Mismatch. (cover story)

The Dark Energy Spectroscopic Instrument (DESI) has provided data suggesting that neutrinos have smaller masses than previously thought, which is surprising to scientists. This discrepancy could be due to the complexities of analyzing cosmological data or it may indicate a need for new physics. The DESI data also challenges the current understanding of the ordering of neutrino masses, which has implications for various theories and experiments. Some scientists propose that the data may suggest the existence of negative mass neutrinos or a mirage of dark energy, while others believe that issues with the cosmic microwave background data from the Planck satellite may be influencing the results. Although direct measurements of neutrino mass on Earth are less precise, they may offer further insights in the future. [Extracted from the article]

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