This presentation is divided into three main parts:
Overview of Large-Scale Structure (LSS) Studies in Cosmology
This section introduces the theoretical framework behind the formation and evolution of large-scale structure, observations on LSS, statistical techniques used for LSS data analysis, and key phenomena (BAO, RSD and AP effect) associated with LSS.
Introduction to 4MOST and the Cosmological Redshift Survey (CRS)
4MOST (4-meter Multi-Object Spectroscopic Telescope) is a new wide-field spectroscopic facility located in the Southern Hemisphere, operated by the European Southern Observatory. It will support 18 major scientific surveys, including studies of the Milky Way, quasars, gravitational lensing, galaxy clusters, and cosmology. Scheduled to begin operations in early 2026. 4MOST CRS—led by PI Jean-Paul Kneib—is designed to conduct rigorous cosmological tests using spectroscopic clustering measurements. Over five years, it will observe approximately 1.5 million Bright Galaxies (BGs), 3.5 million Luminous Red Galaxies (LRGs), and 1.5 million Quasars (QSOs).
My Contribution to 4MOST CRS:
My work involves the selection of 4MOST CRS BG targets and the mitigation of imaging systematics. I compute the angular correlation functions of LRGs using Limber scaling fits. I also compare results derived from two photometric redshift catalogs (DESI Legacy and DES), and ultimately fit a Halo Occupation Distribution (HOD) model using the projected correlation function of LRGs.
BIO
I am Zhou Chen, Second year master student in EPFL physics. I am working my project and master thesis in LASTRO lab (Jean-Paul Kneib). I am also cooperating with 4MOST CRS group.
Host: Cheng Zhao
