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arXiv 2007.07895astro-ph.COgr-qc
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在最终的BOSS数据中有空隙的精确宇宙学

Precision cosmology with voids in the final BOSS data

Nico Hamaus, Alice Pisani, Jin-Ah Choi, Guilhem Lavaux, Benjamin D. Wandelt, Jochen Weller

备注：
46 pages, 18 figures, 1 table. JCAP accepted version after peer review, typos corrected
发表信息：
Journal of Cosmology and Astroparticle Physics, Issue 12, article id. 023 (2020)
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摘要：

我们报告了从最终BOSS DR 12数据集的宇宙空洞中获得的新宇宙学约束。它们源于对平均空隙形状的几何和动态变形的联合分析（即，堆叠的空星系互相关函数）。我们的模型使用层析解投影来推断真实空间的空洞轮廓和自洽帐户的Alcock-Paczynski（AP）的效果和红移空间扭曲（RSD）没有任何事先假设的宇宙学或结构形成。它来自第一物理原理，并提供了一个非常好的描述的数据在线性微扰秩序。我们验证了这个模型的帮助下，模拟目录，并将其应用到最终的BOSS数据约束RSD和AP参数$f/b$和$D_AH/c$，其中$f$是线性增长率，$b$线性星系偏差，$D_A$的同向角直径距离，$H$哈勃率，和$c$光速。此外，我们在分析中包括两个讨厌的参数，以边缘化潜在的系统。在平均红移为$z=0.51$时，我们从全空样品中获得了$f/b=0.540\pm0.091$和$D_AH/c=0.588\pm0.004$。在一个平坦的$Λ$ CDM宇宙学中，这意味着$Ω_\mathrm{m}=0.312\pm0.020$是现今的物质密度参数。当我们使用调查模拟中的其他信息来校准模型时，这些约束将改进为$f/b=0.347\pm0.023$、$D_AH/c=0.588\pm0.003$和$Ω_\mathrm{m}=0.310\pm0.017$。然而，我们强调，校准依赖于特定的宇宙学模型和结构形成假设的模拟，所以校准的结果应被认为是不太稳健。尽管如此，我们的校准独立约束是迄今为止最严格的约束之一，这表明在当前和未来的数据中使用宇宙空洞进行宇宙学研究的巨大潜力。

英文摘要：

We report novel cosmological constraints obtained from cosmic voids in the final BOSS DR12 dataset. They arise from the joint analysis of geometric and dynamic distortions of average void shapes (i.e., the stacked void-galaxy cross-correlation function) in redshift space. Our model uses tomographic deprojection to infer real-space void profiles and self-consistently accounts for the Alcock-Paczynski (AP) effect and redshift-space distortions (RSD) without any prior assumptions on cosmology or structure formation. It is derived from first physical principles and provides an extremely good description of the data at linear perturbation order. We validate this model with the help of mock catalogs and apply it to the final BOSS data to constrain the RSD and AP parameters $f/b$ and $D_AH/c$, where $f$ is the linear growth rate, $b$ the linear galaxy bias, $D_A$ the comoving angular diameter distance, $H$ the Hubble rate, and $c$ the speed of light. In addition, we include two nuisance parameters in our analysis to marginalize over potential systematics. We obtain $f/b=0.540\pm0.091$ and $D_AH/c=0.588\pm0.004$ from the full void sample at a mean redshift of $z=0.51$. In a flat $Λ$CDM cosmology, this implies $Ω_\mathrm{m}=0.312\pm0.020$ for the present-day matter density parameter. When we use additional information from the survey mocks to calibrate our model, these constraints improve to $f/b=0.347\pm0.023$, $D_AH/c=0.588\pm0.003$, and $Ω_\mathrm{m}=0.310\pm0.017$. However, we emphasize that the calibration depends on the specific model of cosmology and structure formation assumed in the mocks, so the calibrated results should be considered less robust. Nevertheless, our calibration-independent constraints are among the tightest of their kind to date, demonstrating the immense potential of using cosmic voids for cosmology in current and future data.

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