暗物质尖峰内的共振中微子味转换
Resonant neutrino flavor conversion within dark matter spikes
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中文总结 AI 辅助
研究暗物质尖峰中微子-暗物质相互作用引起的味转换，发现其可显著改变AGN高能中微子味组成，并可能被IceCube观测检验，提供新探测途径。
中文摘要 AI 辅助
我们研究了中微子与暗物质（DM）相互作用如何改变来自活动星系核（AGNs）的高能中微子的味组成。中心超大质量黑洞周围的暗物质尖峰中的相干前向散射可以产生依赖于味的势，当中微子逃逸时诱导味转换。我们计算了π介子衰变和μ子阻尼源在地球上的味组成，并发现与真空振荡预期存在显著偏差。在中微子能量约为100 TeV时，当耦合加权的净暗物质数密度达到|ε_α(n_χ-n_χ̄)|~10^18 cm^-3时，物质势开始与真空振荡竞争。我们在一个说明性假设下将我们的预测与IceCube味三角测量进行比较，该假设假设弥散通量来源于具有共同中微子产生和暗物质尖峰特性的AGNs。在此假设下，当暗物质诱导的势作用于μ子味并在产生时主导真空项时，pγ μ子阻尼预测位于95% MESE等高线之外。因此，高能中微子味测量可以为天体物理环境中的中微子-暗物质相互作用提供一种新颖的探测手段。
英文摘要
We investigate how neutrino--dark matter (DM) interactions modify the flavor composition of high-energy neutrinos from active galactic nuclei (AGNs). Coherent forward scattering in a DM spike around the central supermassive black hole can generate a flavor-dependent potential, inducing flavor conversion as the neutrinos escape. We calculate the flavor composition at Earth for pion-decay and muon-damped sources and find substantial departures from vacuum-oscillation expectations. At neutrino energies around $100\,\mathrm{TeV}$, the matter potential begins to compete with vacuum oscillations when the coupling-weighted net DM number density reaches $|ε_α(n_χ-n_{\barχ})|\sim10^{18}\,\mathrm{cm}^{-3}$. We compare our predictions with IceCube flavor triangle measurements under the illustrative assumption that the diffuse flux originates from AGNs with common neutrino-production and DM-spike properties. Under this assumption, when the DM-induced potential acts on the muon flavor and dominates the vacuum terms at production, the $pγ$ muon-damped predictions lie outside the 95\% MESE contour. High-energy neutrino flavor measurements can therefore provide a novel probe of neutrino-DM interactions in astrophysical environments.
发表机构
- Washington University（华盛顿大学）
- Technical University of Munich（慕尼黑工业大学）
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