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- W4308756850 abstract "In the early universe, Dirac neutrino magnetic moments due to their chirality-flipping nature could lead to thermal production of right-handed neutrinos, which would make a significant contribution to the effective neutrino number, $N_{rm eff}$. We present in this paper a dedicated computation of the neutrino chirality-flipping rate in the thermal plasma. With a careful and consistent treatment of soft scattering and the plasmon effect in finite temperature field theories, we find that neutrino magnetic moments above $2.7times 10^{-12}mu_B$ have been excluded by current CMB and BBN measurements of $N_{rm eff}$, assuming flavor-universal and diagonal magnetic moments for all three generation of neutrinos. This limit is stronger than the latest bounds from XENONnT and LUX-ZEPLIN experiments, and comparable with those from stellar cooling considerations." @default.
- W4308756850 created "2022-11-15" @default.
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- W4308756850 date "2022-11-08" @default.
- W4308756850 modified "2023-09-27" @default.
- W4308756850 title "Neutrino Magnetic Moments Meet Precision $N_{rm eff}$ Measurements" @default.
- W4308756850 doi "https://doi.org/10.48550/arxiv.2211.04669" @default.
- W4308756850 hasPublicationYear "2022" @default.
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