超轻类轴子背景下与能量无关的中微子退相干
Energy-independent neutrino dephasing from an ultralight axion-like background
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中文总结 AI 辅助
该研究分析超轻类轴子粒子暗物质背景下的中微子振荡，推导其退相干特性，将JUNO首批数据的阻尼约束映射到味基准，给出相关参数限制。
中文摘要 AI 辅助
我们采用活性中微子的自下而上导数相互作用，研究超轻类轴子粒子（ALP）暗物质背景下的中微子振荡。对于在中微子质量基矢中对角的耦合，主导相对相位由ALP在产生和探测之间的场差确定；更一般地，未解析的背景会将每个干涉项乘以该端点场差的特征函数。对于具有均匀采样相位的单固定振幅相干模式，该因子为$J_0(A_{ij})$。在慢飞行和小退相干区域，该结果与高斯 virialized 晕处理在二次阶一致，产生主导的$L^2E^0$抑制。我们确定了两种统计描述适用的有限曝光和相干条件。作为应用，我们将来自JUNO首批数据的与能量无关的阻尼约束解析映射到味基准$g_2=g_3$；在局部ALP密度为$0.4\rm GeV/cm^3$时，低质量平台给出$|\triangle g_{21}|=|\triangle g_{31}|\not\thicksim0.90\rm GeV^{-1}$，该数值是参考阻尼分析的基线匹配有效场论（EFT）重铸，未假设特定的紫外完备性。
英文摘要
We study neutrino oscillations in an ultralight axion-like particle (ALP) dark-matter background using a bottom-up derivative interaction for active neutrinos. For couplings diagonal in the neutrino mass basis, the leading relative phase is fixed by the difference of the ALP field between production and detection. More generally, an unresolved background multiplies each interference term by the characteristic function of this endpoint field difference. For a single fixed-amplitude coherent mode with uniformly sampled phase, the factor is $J_0(A_{ij})$. In the slow-flight and small-dephasing regimes, this result and a Gaussian virialized-halo treatment agree at quadratic order and produce a leading $L^2E^0$ suppression. We identify the finite-exposure and coherence conditions under which the two statistical descriptions apply. As an application, we analytically map the energy-independent damping constraint derived from the first JUNO data onto the flavor benchmark $g_2=g_3$. For a local ALP density of $0.4\mathrm{GeV}/\mathrm{cm}^3$, the low-mass plateau gives $|Δg_{21}|=|Δg_{31}|\lesssim0.90\mathrm{GeV}^{-1}$. This number is a baseline-matched EFT recast of the reference damping analysis. No specific ultraviolet completion is assumed.
