面向DESI巡天的星系实空间分布重构及宇宙学应用研究

本项目是发展一套基于星系实空间分布的宇宙学问题解决方案，围绕新一代红移巡天DESI项目，重点研究：（1）发展面向高红移大体积星系样本的红移畸变修正方法；(2) 重构最优宇宙学假设下的星系实空间分布及宇宙场（密度场、速度场、潮汐场）；（3）实测星系实空间成团性及其演化特征；（4）发展星系实空间分布与弱引力透镜的联合限制；（5）测量出宇宙结构增长率、物质涨落振幅等宇宙学参数信号。进一步，本项目会开发一种基于星系实空间成团性的宇宙学模型限制新方法，给出标准宇宙学及多个主流引力模型参数的高精度测量，并最终建立一个检验理论模型所需的宇宙大尺度结构标准化数据库，包括重构样本、宇宙学参数和星系实空间成团性数据，为宇宙学和宇宙大尺度结构问题研究提供重要的数据支撑。

We will develop a solution to the cosmology problem based on the real-space distributions of the galaxies for the next-generation DESI survey. In detail, we will focus on (1) developing a method to correct redshift-space distortion for the high-redshift and large-volume galaxies; (2)reconstructing the real-space galaxies distributions and the cosmic field (density, velocity and tidal) under the best cosmology background; (3)measuring the real-space clustering with its evolution character; (4)combining the real-space galaxy clustering with galaxy-galaxy weak lensing for the cosmology; (5) measuring the growth rate, clustering amplitude of matter et al. Moreover, we will not only open up a new method to constrain the cosmology model based on the real-space clustering of the galaxies, but also build up a standard database (including the reconstructed samples, cosmic parameters, and real-space galaxies clustering signals) that is necessary and useful for testing the cosmology theory. The research will provide significant support for applying the DESI data to the study on cosmology and large-scale structure.