作为几何宇宙学探针的星系相关函数的节点线
The Nodal Line of the Galaxy Correlation Function as a Geometric Cosmological Probe
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中文总结 AI 辅助
研究提出以星系相关函数的节点线作为几何宇宙学探针，该探针信息独立且互补于BAO。通过DESI DR1星系的分析，节点线能在不同条件下约束Ω_m h^{3/2}，与BAO结合可对H_0产生无声视界约束。
中文摘要 AI 辅助
我们提出了一种几何宇宙学探针：各向异性星系相关函数的节点线，即该函数在平面上符号变化的轨迹。由于节点线仅取决于符号，在任何幅度缩放下都是不变的，其信息大多独立于重子声学振荡（BAO）且与之互补。在对暗能量光谱仪（DESI）DR1星系的概念验证分析中，节点线在固定星系偏差下将Ω_m h^{3/2}限制在3%，在先验为10%时降至4.8%。与BAO结合，对H_0产生了4.45%的无声视界约束。
英文摘要
We propose a geometric cosmological probe: the nodal line of the anisotropic galaxy correlation function --- the locus in the plane where the function changes sign. Because the nodal line depends only on this sign, it is invariant under any amplitude rescaling, and its information is mostly independent of and complementary to BAO. In a proof-of-concept analysis of DESI DR1 galaxies, the nodal line constrains $Ω_m h^{3/2}$ to 3\% at fixed galaxy bias, degrading to 4.8\% under a 10\% prior. Combined with BAO, it yields a 4.45\% sound-horizon-free constraint on $H_0$.
