LOcal Clusters And supercLuster In sZ: Adding Thermal, kInetic and relativistic cOrrectioNs

sZ 中的局部星团和超星团：添加热、动学和相对论校正

• 批准号: 490702358
• 负责人: Privatdozent Dr. Klaus Dolag
• 金额: --
• 依托单位: Lehrstuhl für beobachtende und experimentelle Astrophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/490702358?language=en
• 关键词: LOcal; Clusters; supercLuster; sZ; Adding

Galaxy clusters offer unique opportunities to test the cosmological model. This relies on the use of statistical assessments of their properties from comparison of simulations and observations. To overcome the limitation of statistical approaches, one would ideally need an actual reproduction of the Universe. Constrained simulations now permit building high fidelity clones of the local Large Scale Structure (LSS) of the Universe within 600Mpc diameter valid down to cluster scales. LOCALIZATION will produce and use simulated clones of local clusters and superclusters to fully understand the building up of these cosmic laboratories. We will study their physical and dynamical properties via cosmic flows, X-rays and Sunyaev-Zeldovich signals and we will derive the cosmological signatures of the local LSS on the cosmic background at large scales. LOCALIZATION will pave the way from precision cosmology from averaged statistics towards accurate understanding of the cosmological growth of structures.Indeed, the ΛCDM model is a great success, still the advent of precision cosmology revealed yet unexplained discrepancies between theoretical expectations and observations. Among these the difference between the linearly evolved amplitude of the matter power spectrum measured with the CMB and galaxy clusters, i.e. σ8 tension, as well as CMB large-scale anomalous features. By revisiting these two debated cosmological issues, LOCALIZATION seeks, for the first time, a common solution to both of them. To address this challenge, a comprehensive analysis of the local galaxy clusters and LSS and of their impact on the CMB will be performed based on the hydrodynamical numerical clones of the local Universe up to z<0.07. An unbiased comparison between observational data from Planck and numerical local cluster, supercluster and full LSS clones will be performed.Thanks to LOCALIZATION’s cluster clones, we will derive for the first time the exact relation between cluster masses and their observed proxies. We will address the CMB anomalies in Planck data focusing on sources of CMB signal that contribute at the largest angular scales from the local supercluster and clusters. In addition thanks to the state-of-the-art constrained simulations, we will perform the first exhaustive estimate of the contribution from all possible secondary CMB anisotropies at large angular scales.With LOCALIZATION we will thus answer the following questions: Can the σ8 tension be solved or reduced with a scaling relation exactly and faithfully calibrated thanks to local cluster clones from LOCALIZATION simulations? and How much of the low-multipole CMB anomalies can be explained by the local extragalactic environment fully reproduced by the local LSS clone built within LOCALIZATION?

星系团为测试宇宙学模型提供了独特的机会。这依赖于通过模拟和观察的比较对其属性进行统计评估。为了克服统计方法的局限性，理想情况下需要对宇宙进行实际复制。约束模拟现在允许在 600Mpc 直径范围内构建宇宙局部大尺度结构 (LSS) 的高保真克隆，有效达到星团尺度。本地化将产生并使用本地星团和超星团的模拟克隆，以充分了解这些宇宙实验室的建设。我们将通过宇宙流、X射线和Sunyaev-Zeldovich信号研究它们的物理和动力学特性，并且我们将在大尺度的宇宙背景上推导出局部LSS的宇宙学特征。定位将为从平均统计的精确宇宙学到准确理解宇宙结构增长铺平道路。确实，ΛCDM模型取得了巨大成功，但精确宇宙学的出现仍然揭示了理论预期与观测之间尚未解释的差异。其中包括CMB和星系团测量的物质功率谱线性演化幅度之间的差异，即σ8张力，以及CMB大尺度异常特征。通过重新审视这两个有争议的宇宙学问题，定位首次寻求对这两个问题的共同解决方案。为了应对这一挑战，将基于 z<0.07 以内的本地宇宙的流体动力学数值克隆，对本地星系团和 LSS 及其对 CMB 的影响进行全面分析。将对来自普朗克的观测数据与数值局部星团、超星团和完整 LSS 克隆进行无偏比较。借助 LOCALIZATION 的星团克隆，我们将首次推导出星团质量与其观测到的代理之间的确切关系。我们将解决普朗克数据中的 CMB 异常问题，重点关注本地超星团和星团在最大角度尺度上做出贡献的 CMB 信号源。此外，得益于最先进的约束模拟，我们将对大角度尺度下所有可能的次级 CMB 各向异性的贡献进行首次详尽估计。通过定位，我们将回答以下问题：借助定位模拟中的本地簇克隆，能否通过精确且忠实地校准的缩放关系来解决或减少 σ8 张力？有多少低多极 CMB 异常可以通过本地化中构建的本地 LSS 克隆完全再现的本地河外环境来解释？