论文标题
中微子磁矩的强宇宙学限制
Strong cosmological constraints on the neutrino magnetic moment
论文作者
论文摘要
中微子的相当大的磁矩将是外来物理学的证据。在早期的宇宙中，具有磁矩的左手中微子会与原始血浆中的电磁场相互作用，翻转其螺旋性并产生右手（RH）中微子的种群。在这项工作中，我们介绍了多组分原始等离子体中RH中微子的生产率的新计算，并量化了它们对早期相对论物种的总能量密度的贡献，这强调了对初始时间生产时间的依赖的含义。我们发现，当前的宇宙学数据排除了磁矩$μ\ gtrsim的值1.6 \ times 10^{ - 11} 〜μ_b $，而未来的宇宙学实验将能够探测Rh Neutrinos的非热产生，从而与Stellar Limits竞争。
A sizable magnetic moment for neutrinos would be evidence of exotic physics. In the early Universe, left-handed neutrinos with a magnetic moment would interact with electromagnetic fields in the primordial plasma, flipping their helicity and producing a population of right-handed (RH) neutrinos. In this work, we present a new calculation of the production rate of RH neutrinos in a multi-component primordial plasma and quantify their contribution to the total energy density of relativistic species at early times, stressing the implications of the dependence on the initial time for production. We find that current cosmological data exclude values of the magnetic moment $μ\gtrsim 1.6\times 10^{-11}~μ_B$, while future cosmological experiments will be able to probe non-thermal production of RH neutrinos, becoming competitive with stellar limits.
