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
Shaoping Li
(IHEP)
Co-author
Prof.
Xunjie Xu
(IHEP)
