Title: Galaxy Clustering: Applications in the Galaxy–Halo Connection and Cosmology

Speaker: Dr. Xu Haojie（The Shanghai Astronomical Observatory, CAS）

Time: 10:30pm, October 23, 2025

Location: 3-402, PMO Xianlin Campus

Abstract: Galaxies are not randomly distributed in the Universe. On large scales, their clustering reflects the underlying distribution of dark matter, which is governed by cosmological parameters. On smaller scales, galaxy formation physics determines how galaxies with different properties occupy dark matter haloes. In this talk, I will present several applications of galaxy clustering as a powerful statistical tool: constraining cosmological parameters in combination with galaxy–galaxy lensing; calibrating redshift distributions of photometric galaxy samples without  resorting to spectroscopic redshifts; and probing the joint distribution of color, magnitude, and halo mass for present-day galaxies.