通过大尺度结构中暗物质与宇宙线的相互作用探测类轴子粒子-质子相互作用
Probing Axion Like Particle-Proton Interactions through the Interplay of Dark Matter and Cosmic Rays in Large-Scale Structure
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中文总结 AI 辅助
本研究利用暗物质晕内类轴子暗物质与宇宙线质子的散射产生的弥散γ射线，通过费米LAT的未分辨γ射线背景与2MRS星系表的交叉关联，提出了探测类轴子粒子-质子相互作用的新方法，为间接暗物质搜寻开辟了新途径。
中文摘要 AI 辅助
类轴子粒子（ALPs）是一种动机充分的暗物质候选体，其与标准模型粒子的相互作用可能产生可观测的宇宙学信号。我们研究暗物质晕内类轴子暗物质与宇宙线（CR）质子散射过程产生的弥散γ射线辐射，并通过费米大视场望远镜（Fermi LAT）测量的未分辨γ射线背景（UGRB）与本地宇宙（z≤0.1）的2微米全天巡天红移巡天（2MRS）星系表之间的交叉关联，探索其可探测性。为模拟宇宙学GeV-PeV能量段的宇宙线质子群体，我们开发了一种唯象的自下而上方案，该方案通过超新星率将宇宙线注入与恒星形成率关联，而稳态宇宙线密度由扩散逃逸决定。我们的预测表明，UGRB-星系交叉关联测量可探测类轴子参数空间中此前未被探索的广阔质量范围区域。更广泛地说，本研究提出了一个由暗物质与额外天体物理场相互作用产生的宇宙学可观测量的通用框架，为利用大尺度结构观测开展间接暗物质搜寻开辟了新途径。
英文摘要
Axion-like particles (ALPs) provide a well-motivated dark matter candidate whose interactions with Standard Model particles may generate observable cosmological signatures. We investigate the diffuse $γ$-ray emission produced by the scattering process between ALP dark matter and cosmic-ray (CR) protons inside dark matter halos, and explore its detectability through the cross-correlation between the unresolved $γ$-ray background (UGRB) measured by \textit{Fermi} Large Area Telescope (LAT) and the Two Micron All Sky Survey Redshift Survey (2MRS) galaxy catalog in the local Universe ($z\leq0.1$). To model the cosmological $\mathrm{GeV}$-$\mathrm{PeV}$ CR proton population, we develop a phenomenological bottom-up prescription that links CR injection to the star formation rate through the supernova rate, while the steady-state CR density is determined by diffusive escape. Our forecasts indicate that UGRB-galaxy cross-correlation measurements can probe previously unexplored regions of the ALP parameter space over a broad range of ALP masses. More generally, this work presents a general framework for cosmological observables generated by interactions between dark matter and an additional astrophysical field, opening a new avenue for indirect dark matter searches using large-scale structure observations.
