The cosmological power spectrum of the coherent matter flow is measured exploiting an improved prescription for the apparent anisotropic clustering pattern in redshift space. New statistical analysis is presented to provide an optimal observational platform to link the improved redshift distortion theoretical model to future real datasets. The statistical power as well as robustness of our method are tested against 60 realizations of 8 Gpc/h^3 dark matter simulation maps mocking the precision level of upcoming wide--deep surveys. We showed that we can accurately extract the velocity power spectrum up to quasi linear scales of k~0.1 h/Mpc at z = 0.35 and up to k~0.15 h/Mpc at higher redshifts within a couple of percentage precision level. Our understanding of redshift space distortion is proved to be appropriate for precision cosmology, and our statistical method will guide us to righteous path to meet the real world.
Accelerated expansion of the universe and chasing photons from the CMB to study the late time integrated Sachs-Wolfe effect over different redshift ranges
Peculiar velocities in the local Universe: comparison of different models and the implications for $H_0$ and dark matter
在测量哈勃参数$H_0$的值时，有必要知道不受特殊速度影响的后退速度。在这项工作中，我们研究了不同模型的特有速度在本地宇宙。特别是，我们比较模型的基础上密度重建星系红移调查和核平滑的奇特的速度数据。从密度重建的速度场是使用2 M ++星系红移汇编，这是比较两个自适应内核平滑的速度场：第一个从6dF基本面样本和其他使用Tully-Fisher目录通过结合SFI++和2 MTF获得。我们强调，平滑的速度场应重新调整，以获得无偏的速度估计。比较这些模型的预测，从几个测试集的奇特的速度数据，从第二次修正超新星目录和塔利-费舍尔目录，我们发现，2 M ++重建提供了一个更好的模型的奇特的速度在本地宇宙比内核平滑的奇特的速度模型。研究了特殊速度对引力波和超脉泽中$H_0$测量的影响。在这样做时，我们引入了一个概率框架，边缘化沿视线的特殊速度修正。对于超脉泽，我们用2 M ++速度场求出了$H_0 = 69^{+2.9}_{-2.8}$ km s^{-1} Mpc^{-1}。我们还研究了星系NGC 1052-DF 2的特殊速度，得出的结论是，短$\sim$ 13 Mpc的距离是不是一个可能的解释，该星系的暗物质分数低。
Constraints on the $z\sim5$ Star-Forming Galaxy Luminosity Function From $\textit{Hubble Space Telescope}$ Imaging of an Unbiased and Complete Sample of Long Gamma-ray Burst Host Galaxies
Halo assembly bias in the early Universe: a clustering probe of the origin of the Little Red Dots
Peking University（北京大学）；Kavli Institute for Astronomy and Astrophysics, Peking University（北京大学科维理天文与天体物理研究所）；Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology（麻省理工学院科维理天体物理与空间研究）
Cosmic CORALS: Timing the Universe with high-z star clusters
Università di Bologna（博洛尼亚大学）；INAF - Osservatorio di Astrofisica e Scienza dello Spazio di Bologna（意大利国家天体物理研究所博洛尼亚天文与空间科学观测站）；Université de Genève（日内瓦大学）；ETH Zurich（苏黎世联邦理工学院）；University of Barcelona（巴塞罗那大学）；ICREA（加泰罗尼亚高级研究学院）；IEEC, Institut d’Estudis Espacials de Catalunya（加泰罗尼亚空间研究院）
