AI 中文总结
该研究提出利用引力波与中性氢强度映射的交叉关联作为独立宇宙学探针，结合特定探测器网络可实现对哈勃常数等宇宙学参数的高精度稳健约束。
AI 中文摘要
我们探索引力波（GW）事件与中性氢（HI）强度映射巡天之间的交叉关联作为独立宇宙学探针的潜力。聚焦于爱因斯坦望远镜（ET）和平方公里阵列射电望远镜（SKAO），并假设双黑洞并合与HI辐射是潜在暗物质分布的有偏示踪物，我们利用它们的角自关联谱和交叉关联谱来约束宇宙学参数。我们测试三种不同的GW探测器网络：单独的ET（包括其Δ和2L两种构型），以及ET-2L与宇宙探险家（Cosmic Explorer）的组合。结果表明，交叉关联方法可自然减轻示踪物特定的系统误差，从而给出稳健的宇宙学约束，使哈勃常数H₀的精度达到亚百分比（约0.5%）。此外，该方法能稳健约束宇宙再电离后时代的宇宙膨胀历史，且不同于传统标准汽笛，它还能同时探测物质扰动的大尺度分布，使总物质密度Ωₘ的相对不确定度约为1.3%，晚时成团振幅σ₈的相对不确定度约为1.6%。
英文摘要
We explore the potential of cross-correlation between gravitational wave (GW) events and neutral hydrogen (HI) intensity mapping surveys to serve as an independent cosmological probe. Focusing on the ET and the SKAO, and assuming that binary black hole mergers and HI emission are biased tracers of the underlying dark matter distribution, we use their angular auto- and cross-correlation spectra to constrain cosmological parameters. We test three different GW detector networks: ET alone, both in its $Δ$ and 2L configuration, and ET-2L together with Cosmic Explorer. We show that the cross-correlation method, by naturally mitigating tracer-specific systematics, yields robust cosmological bounds, allowing for a sub-percent ($\sim 0.5\%$) precision on the Hubble constant $H_\mathrm{0}$. Furthermore, this approach robustly constrains the cosmic expansion history throughout the post-reionization era of the Universe and, unlike conventional standard sirens, simultaneously probes the large scale distribution of matter perturbations, achieving relative uncertainties of approximately 1.3% on the total matter density $Ω_\mathrm{m}$ and 1.6% on the late-time clustering amplitude $σ_8$.
Comments37 pages, 15 figures
