Shanghai Astronomical Observatory Astrophysics Colloquium

Title：Emulate the untapped scales of cosmic large scale structure

Speaker：Zhongxu Zhai(SJTU)

Location: Lecture Hall, 3rd floor

Tencent Conference ID: 429-1540-0486 password: 6360

Time：3:00 pm March. 16th (Thursday)

Abstract：

The spatial distribution of galaxies reveals a coherent structure at large scales. The analysis based on observational data from sky surveys has provided us accurate measurement of the cosmic distance scales through baryon acoustic oscillation (BAO), and linear growth rate through redshift space distortion (RSD) effect. On the other hand, the distribution at small scale is also informative. However, extracting the information at this scale is challenging due to the non-linearity of the dark matter dynamics and the coupling with galaxy formation processes. I will introduce the emulator approach on the modeling of galaxy clustering at non-linear scale based on high resolution N-body simulations, and the latest result from the application to the data of massive galaxies from BOSS and eBOSS. The analysis reports a tight constraint on the linear growth rate with some tension with other experiments. I will show follow-up works and extensions from both observational side and modeling side.

CV：

Dr. Zhongxu Zhai obtained the PhD from New York University in 2018, and then did the first postdoc at Caltech/IPAC from 2018 to 2021, and a short second postdoc at the University of Waterloo from 2021 to 2022. He joined the Department of Astronomy, Shanghai Jiao Tong University as a faculty member from 2022/09. His research is in the field of cosmology and galaxy science, using methodologies from numerical simulation, statistical analysis, and observational data from galaxy surveys.

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