Zhongxu Zhai is a postdoctral fellow at the Waterloo Centre for Astrophysics. Prior to that, he was a postdoctoral researcher at Caltech/IPAC. He obtained his PhD from New York University in 2018. His work focuses on the large-scale structure of galaxies and dark matter halos, and observational tests of standard Lambda-CDM cosmological model.
Talk Title and Abstract
Cosmological constraint using large scale structure from galaxy redshift surveys
The spatial distribution of galaxies reveals a coherent structure at large scale. The analysis based on observational data from sky surveys has provided us accurate measurement of cosmic distance scales through baryon acoustic oscillation (BAO) and linear growth rate through redshift space distortion (RSD) effect. I will introduce our recent works on the investigation of large scale structure from ongoing and future surveys. In particular, I will focus on the galaxy redshift survey from Nancy Grace Roman Space Telescope and introduce our forecast using emission line galaxies to measure cosmological parameters. In addition, I will introduce an emulator approach to model galaxy correlation function at non-linear scales. This method is able to provide more constraining power than large scales. Using the data from BOSS, we can obtain accurate measurements of linear growth rate over a wide redshift range.
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