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Jul 2 – 8, 2023
Sun Yat-sen University Zhuhai Campus
Asia/Shanghai timezone

Neutrino Magnetic Moments Meet Precision $N_{\rm eff}$ Measurements

Jul 3, 2023, 3:30 PM
1h

Speaker

Shaoping Li (IHEP)

Description

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, Neff . In this talk, I will show that the neutrino magnetic moments above $2.7\times 10^{-12}\mu_B$ have been excluded by current CMB and BBN measurements of $N_{\rm eff}$. This limit is stronger than the latest bounds from XENONnT and LUX-ZEPLIN experiments and comparable with those from stellar cooling considerations.

Primary author

Co-author

Prof. Xunjie Xu (IHEP)

Presentation materials