Can two of the three light neutrino masses be exactly degenerate in the context of current experimental data?
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2016 PDG review citing this review lists $3\sigma$ allowed value for $\Delta m_{21}^2/[10^{-5} eV^2]=(6.93 - 7.97)$. Mass degeneracy would also allow to simplify PMNS matrix by making certain phases unobservable whereas they are known to be non-zero.
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$\begingroup$ Both the mass square differences $\Delta m^2_{21}$ and $\Delta m^2_{23}$ have been measured to be nonzero. Doesn't that rule out the possibility of any two neutrino masses being degenerate? @OON $\endgroup$– SRSCommented Oct 19, 2019 at 14:00
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$\begingroup$ @SRS yep, and no one claimed that they are degenerate. $\endgroup$– OONCommented Oct 19, 2019 at 20:48