Quijote模拟中的空洞概率函数
Void probability function in the Quijote simulations
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中文总结 AI 辅助
本研究利用Quijote模拟系统研究空洞概率函数对宇宙学、红移、晕质量及形态的依赖，发现其可区分ΛCDM扩展模型，为未来巡天提供高效探针。
中文摘要 AI 辅助
空洞概率函数（VPF）是在给定体积内找不到任何示踪体（星系或暗物质晕）的概率，它对大尺度物质分布敏感。我们利用Quijote N体模拟，在一系列宇宙学模型（包括ΛCDM及其若干扩展模型）中研究了暗物质晕和星系的VPF。我们考察了VPF对宇宙学参数、红移、晕质量、形态以及样本稀释度的依赖关系，并将结果与几何层次（GH）模型和负二项（NB）模型的理论预测进行了比较。我们发现，晕的VPF对宇宙学参数和晕质量敏感，在z=0时遵循GH模型，其中ΛCDM模型的偏差最小，而大质量中微子宇宙学的偏差最大。在更高红移和更强样本稀释度下，VPF偏离GH模型，趋近于NB模型。VPF对晕质量的依赖随宇宙学模型而变化，在ΛCDM中，低质量晕显示出最大偏差，而在修正引力情景中，中等质量和高质量晕显示出更强偏差。在红移空间中，VPF向NB模型偏移，其中原初非高斯性产生最大偏差。对于星系，VPF取决于形态和宇宙学，椭圆星系遵循GH模型，而旋涡星系遵循NB模型。我们还发现，宇宙方差在VPF测量中引入了不可忽略的散布。总体而言，这些结果表明，在即将开展的大体积星系巡天中，VPF可作为计算高效的探针，用于区分标准ΛCDM模型的扩展模型。
英文摘要
The void probability function (VPF) is the likelihood of finding no tracers (galaxies or dark-matter haloes) within a given volume and is sensitive to the large-scale matter distribution. We investigate the VPF of dark matter haloes and galaxies using the \textsc{Quijote} N-body simulations across a range of cosmological models, including $Λ$CDM and several extensions. We examine its dependence on cosmology, redshift, halo mass, morphology, and sample dilution, and compare the results with theoretical predictions from the geometric hierarchical (GH) and negative binomial (NB) models. We find that the halo VPF is sensitive to cosmology and halo mass and follows the GH model at $z=0$, with $Λ$CDM showing the smallest deviation and the massive-neutrino cosmology the largest. At higher redshift and stronger sample dilution, the VPF departs from the GH model and approaches the NB model. The dependence on halo mass varies with cosmology, with low-mass haloes showing the largest deviations in $Λ$CDM, while intermediate- and high-mass haloes show stronger deviations in the modified-gravity scenario. In redshift space, the VPF shifts toward the NB model, with primordial non-Gaussianity producing the largest deviations. For galaxies, the VPF depends on morphology and cosmology, with ellipticals following the GH model and spirals following the NB model. We also find that cosmic variance introduces non-negligible scatter in the VPF measurements. Overall, these results suggest that the VPF could be useful as a computationally efficient probe to distinguish extensions of the standard $Λ$CDM model in upcoming large-volume galaxy surveys.
发表机构
- Graduate Institute of Astronomy, National Central University（中央大学天文研究所）
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