Precision cosmology from high-precision theoretical template for large-scale structure of the Universe

来自宇宙大尺度结构高精度理论模板的精密宇宙学

• 批准号: 21740168
• 负责人: TARUYA Atsushi
• 金额: $ 2.33万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740168/
• 关键词: 宇宙物理(理論); 精密宇宙論; 宇宙大規模構造; 精密理論テンプレート; 赤方偏移歪み; ダークエネルギー; パワースペクトル; 理論テンプレート; 原始非ガウス性; バイスペクトル

Recent progress on cosmological observations has led to the establishment of the" standard cosmologica", and the cosmology is now going to enter the era of precision cosmology, to deeply understand the nature and origin of the Universe. In the coming decade, extremely large-scale and/or high-precision cosmological observations will be the keys to improve our understanding of the Universe, and in order to detect/measure a weak but physically important signal, highly demanding is the precision theoretical template for cosmological measurements. In this project, we have focused on the large-scale structure of the universe as a promising cosmological probe, and developed analytical frameworks to compute high-precision theoretical template for next-generation galaxy redshift surveys. Based on the perturbation theory of large-scale structure, we have succeeded to incorporate the various observational/physical systematics into the precision template, including the non-linear gravitational evolution, redshift-space distortions, and galaxy biasing. The theoretical template developed in this project will play a very crucial role to interpret cosmological data from upcoming spectroscopic surveys such as SuMIRe project(Subaru Measurement of Imaging and Redshifts) in Japanese astronomy and cosmology group.

近年来宇宙学观测的进展导致了”标准宇宙学”的建立，宇宙学即将进入精确宇宙学时代，以深入理解宇宙的本质和起源。在未来十年，超大规模和/或高精度的宇宙学观测将是提高我们对宇宙认识的关键，为了检测/测量微弱但物理上重要的信号，对宇宙学测量的精确理论模板要求很高。在该项目中，我们重点关注宇宙的大尺度结构作为一种有前途的宇宙学探测，并开发了分析框架来计算下一代星系红移调查的高精度理论模板。基于大尺度结构的微扰理论，我们成功地将各种观测/物理系统学纳入到精确模板中，包括非线性引力演化，红移空间畸变和星系偏置。该项目中开发的理论模板将在解释来自日本天文学和宇宙学小组的SuMIRe项目（Subaru Measurement of Imaging and Redshifts）等即将到来的光谱调查的宇宙学数据中发挥非常关键的作用。