发表机构
Indian Institute of Science; Saha Institute of Nuclear Physics（印度科学学院; 萨哈核物理研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究首次利用COMAP巡天的线强度映射数据，通过Fisher预测分析功率谱和体素强度分布，探测暗物质-重子弹性散射，发现对亚GeV暗物质在特定相互作用下灵敏度优于现有宇宙学限制。
AI 中文摘要
线强度映射（LIM）是一种新兴技术，用于探测星系形成的天体物理学以及大尺度结构的宇宙学演化。我们首次利用即将开展的碳 monoxide 映射阵列项目（COMAP）巡天，即 COMAP-EoR（再电离纪元）和 COMAP-ERA（扩展再电离阵列），研究其作为暗物质-重子（DM-$b$）相互作用探针的潜力。暗物质（DM）与重子（即质子（$p$）和电子（$e$））的弹性散射会与暗物质交换动量和热量，抑制结构形成，并在线性物质功率谱中留下特征信号。这些效应会传播到 LIM 功率谱（PS）和体素强度分布（VID）。我们考虑动量传递截面 $\sigma^{\chi b}_{T,n}=\sigma^{\chi b}_{n}v^n$，其中 $n=0,-2,-4$，分别对应接触、电偶极矩类似和库仑类似相互作用。利用 Fisher 预测，我们获得了 PS 和 VID 对 $\sigma^{\chi b}_{n}$ 的预期灵敏度。我们仅使用 VID 的预测，结合 16 和 30 GHz 观测频段，对于亚 GeV 暗物质质量，在 $n=-2$ 和 $n=-4$ 情况下，比现有宇宙学限制更强。我们还探索了结合 PS 和 VID 来探测这些相互作用的潜力。我们的研究强调了 LIM 作为暗物质模型的补充探针，与其他天体物理、宇宙学和地面搜索相辅相成。
英文摘要
Line-intensity mapping (LIM) is an emerging technique for probing both the astrophysics of galaxy formation and the cosmological evolution of large-scale structure. We investigate, for the first time, its potential as a probe of dark matter-baryon (DM-$b$) interactions using the upcoming Carbon Monoxide Mapping Array Project (COMAP) surveys, COMAP-EoR (Epoch of Reionization) and COMAP-ERA (Expanded Reionization Array). Elastic scattering of dark matter (DM) with baryons, i.e., protons ($p$) and electrons ($e$), exchange momentum and heat with the DM, suppressing structure formation and leaving characteristic signatures in the linear matter power spectrum. These effects propagate to the LIM power spectrum (PS) and voxel intensity distribution (VID). We consider momentum-transfer cross sections $σ^{χb}_{T,n}=σ^{χb}_{n}v^n$, with $n=0,-2,$ and $-4$, corresponding to contact, electric dipole-moment-like, and Coulomb-like interactions, respectively. Using Fisher forecasts, we obtain the projected sensitivities to $σ^{χb}_{n}$ from the PS and VID. Our VID-only forecasts combining the 16 and 30 GHz observed bands yield stronger sensitivities than existing cosmological limits for $n=-2$ and $n=-4$ for sub-GeV DM masses. We also explore the potential of combining the PS and VID to probe these interactions. Our study highlights LIM as a complementary probe of DM models alongside other astrophysical, cosmological, and terrestrial searches.
Commentsv1: 28 pages, 15 figures. Comments are welcome. For a short video explaining the work, please see:https://youtu.be/JQtsGuOoQNM?si=zlQhGX9KURA0_Ezr
