论文标题
中微子磁矩满足精度$ n _ {\ rm eff} $测量
Neutrino Magnetic Moments Meet Precision $N_{\rm eff}$ Measurements
论文作者
论文摘要
在早期的宇宙中，由于其手性脱落性质，迪拉克中微子磁矩可能导致右手中微子的热产生，这将为有效的中微子数字（$ n _ _ {\ rm eff} $）做出重大贡献。我们在本文中介绍了热等离子体中中微子手性速度的专门计算。在有限温度场理论中仔细且一致地处理软散射和等离子效应，我们发现中微子磁矩超过$ 2.7 \ times 10^{ - 12}μ_b$被当前的CMB和BBN测量值$ n _ {\ rm eff} $，假设a {\ rm eff} $，假设味觉 - exunive-nipen for-diational for to niments for for to nipe-nipen for nipoinal for for ailt for niments for hin for niment for hin。该限制比Xenonnt和Lux-Zeplin实验的最新界限要强，并且与出色的冷却考虑因素相媲美。
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 $2.7\times 10^{-12}μ_B$ 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.
