利用Zel'dovich启发变换预测非线性暗物质晕密度场的宇宙学约束
Forecasting cosmological constraints from the nonlinear halo density field with Zel'dovich-inspired transform
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中文总结 AI 辅助
本研究利用Zel'dovich启发变换的暗物质晕密度场功率谱，通过Fisher分析证明其能显著收紧标准宇宙学参数、中微子质量及原初非高斯性约束，优于传统功率谱和标记功率谱。
中文摘要 AI 辅助
Zel'dovich启发（ZI）变换是一种对密度场进行局部非线性变换的方法，能够将晚期物质场高斯化，并通过其功率谱恢复来自高阶$N$点相关函数的信息，其中参数$\eta$控制高阶信息的权重。利用Quijote和Quijote-PNG模拟中的暗物质晕目录，我们通过Fisher矩阵分析研究了ZI变换后的暗物质晕密度场的红移空间单极功率谱。由$\eta=1$、$10$和$+\infty$三个代表性变换构建的联合统计量$P_{\rm ZI,0}$，在标准宇宙学参数、中微子质量和原初非高斯性振幅的约束上，比传统暗物质晕功率谱$P_{\rm h,0}$显著更紧，并且在许多参数上优于标记功率谱。我们进一步校准了ZI功率谱的尺度依赖噪声修正，其有效噪声振幅依赖于波数，并发现该修正进一步收紧了约束。特别地，相对于$P_{\rm h,0}$，噪声修正后的$P_{\rm ZI,0}$将$f_{\rm NL}^{\rm equil}$、$f_{\rm NL}^{\rm ortho}$、$M_\nu$和$n_{\rm s}$的约束分别提高了$5.6$、$5.5$、$5.2$和$5.8$倍。这些结果展示了ZI功率谱作为标准两点统计量的补充，在提取非线性宇宙学信息方面的潜力。由于暗物质晕目录的数密度远低于未来星系巡天预期值，我们的预测可能是保守的。
英文摘要
The Zel'dovich-inspired (ZI) transform is a local nonlinear transform of the density field that can Gaussianize the late-time matter field and recover information from higher-order $N$-point correlation functions through its power spectrum, with the parameter $η$ controlling the weighting of higher-order information. Using Fisher-matrix analyses of halo catalogs from the Quijote and Quijote-PNG simulations, we study the redshift-space monopole power spectrum of the ZI-transformed halo density field. The joint statistic $P_{\rm ZI,0}$, constructed from three representative transforms with $η=1$, $10$, and $+\infty$, yields substantially tighter constraints than the conventional halo power spectrum $P_{\rm h,0}$ on standard cosmological parameters, the summed neutrino mass, and primordial non-Gaussianity amplitudes, while outperforming the marked power spectrum for many parameters. We further calibrate a scale-dependent noise correction for the ZI power spectrum, with an effective noise amplitude that depends on wavenumber, and find that the correction further tightens the constraints. In particular, the noise-corrected $P_{\rm ZI,0}$ improves the constraints on $f_{\rm NL}^{\rm equil}$, $f_{\rm NL}^{\rm ortho}$, $M_ν$, and $n_{\rm s}$ by factors of $5.6$, $5.5$, $5.2$, and $5.8$, respectively, relative to $P_{\rm h,0}$. These results demonstrate the potential of ZI power spectra as a complement to standard two-point statistics for extracting nonlinear cosmological information. Our forecasts may be conservative because the halo catalogs have substantially lower number densities than those expected from forthcoming galaxy surveys.
发表机构
- Jilin University（吉林大学）
- Università di Parma（帕尔马大学）
- INFN Gruppo Collegato di Parma（意大利国家核物理研究所帕尔马协作组）
- Changchun Observatory of National Astronomical Observators, Chinese Academy of Sciences（中国科学院国家天文台长春观测站）
- National Astronomical Observators, Chinese Academy of Sciences（中国科学院国家天文台）
- Shanghai Jiao Tong University（上海交通大学）
- Northeastern University（东北大学）
机构由 AI 辅助整理，请以论文原文为准。
