AI 中文总结
本研究利用JWST/NIRSpec空白天区数据，分析惰性中微子跃迁磁矩产生的红外谱线，推导了相关参数限制，还得到了对类戈德斯通玻色子耦合的灵敏度。
AI 中文摘要
我们利用公开的JWST/NIRSpec积分场单元（IFU）空白天区观测数据，研究辐射衰变惰性中微子暗物质产生的红外谱线特征。主要考虑的信号是由跃迁偶极系数$d_{NN\gamma}$诱导的惰性中微子$N_1$到$N_2$的跃迁$N_1\to N_2\gamma$，其中$m_1>m_2$。与轴子类或类戈德斯通玻色子粒子的普通双光子衰变不同，观测到的光子能量不由整个暗物质质量决定，而是由小质量分裂$\Delta m=m_1-m_2$决定。因此，keV尺度的惰性中微子暗物质态可在JWST波段产生eV尺度的红外光子谱线。我们针对GN-z11方向的NIRSpec IFU F170LP-G235M空白天区数据，构建基于$\chi^2$的谱线搜索分析，用三次样条建模平滑连续谱，并包含银河系晕衰变通量。在未发现显著超出的情况下，我们推导了$0.1\\,{\rm eV}\lesssim\Delta m\lesssim1\\,{\rm eV}$时$d_{NN\gamma}$和衰变宽度$\Gamma_{N_1\to N_2\gamma}$的预期限制。对于占满暗物质丰度的惰性组分，最强灵敏度达到$d_{NN\gamma}\lesssim7\times10^{-14}\\,{\rm GeV}^{-1}$，$\Gamma_{N_1\to N_2\gamma}\lesssim10^{-25}\\,{\rm s}^{-1}$。我们还纳入了最小反常类戈德斯通玻色子基准$\omega\to\gamma\gamma$，得到JWST对$\lambda_{\omega\gamma\gamma}$的灵敏度，在$m_\omega\sim0.6$-$1\\,{\rm eV}$时约为$10^{-11}$-$10^{-9}\\,{\rm GeV}^{-1}$。
英文摘要
We investigate infrared line signatures from radiatively decaying sterile-neutrino dark matter using publicly available JWST/NIRSpec IFU blank-sky observations. The main signal considered is the sterile-to-sterile transition $N_1\to N_2γ$, induced by the transition magnetic dipole coefficient $d_{NNγ}$, with $m_1>m_2$. In contrast to ordinary two-photon decays of axion-like or Majoron-like particles, the observed photon energy is not fixed by the full dark matter mass, but by the small mass splitting $Δm=m_1-m_2$. Thus, a keV-scale sterile-neutrino dark matter state can generate an eV-scale infrared photon line in the JWST band. We construct a $χ^2$-based line-search analysis using the NIRSpec IFU $\rm F170LP$-$\rm G235M$ blank-sky data toward $\rm GN\text{-}z11$, modelling the smooth continuum with a cubic spline and including the Milky Way halo decay flux. In the absence of a significant excess, we derive projected limits on $d_{NNγ}$ and on the decay width $Γ_{N_1\to N_2γ}$ for $0.1~{\rm eV}\lesssimΔm\lesssim1~{\rm eV}$. For a sterile component saturating the dark matter abundance, the strongest sensitivity reaches $d_{NNγ}\lesssim7\times10^{-14}~{\rm GeV}^{-1}$ and $Γ_{N_1\to N_2γ}\lesssim10^{-25}~{\rm s}^{-1}$. We also include a minimal anomalous-Majoron benchmark, $ω\toγγ$, obtaining JWST sensitivity to $λ_{ωγγ}\sim10^{-11}$-$10^{-9}~{\rm GeV}^{-1}$ for $m_ω\sim0.6$-$1~{\rm eV}$.
Comments12 pages, 6 figures
