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The Dark Energy Spectroscopic Instrument (DESI) enables precision cosmology by mapping the large-scale distribution of galaxies with unprecedented detail. A central component of this effort is the full-shape analysis of galaxy clustering, which extracts information beyond the baryon acoustic oscillation (BAO) feature. In this talk, I will present the main scientific results from the DESI DR1 full-shape analysis, together with the lessons we have learned, focusing on the challenges of obtaining robust cosmological constraints in the presence of observational and modeling systematics. In particular, I will discuss how the parameter projection effect, fiber collision effect, and imaging systematics are addressed in the DR1 analysis. Looking ahead, I will also outline future prospects, including the application of multi-tracer techniques and full-shape analysis with post-reconstruction data, which will be crucial for fully exploiting the cosmological information from DESI data.

BIO

Ruiyang Zhao completed his Ph.D in astrophysics at the National Astronomical Observatory of China (NAOC) in January 2025 under the supervision of Prof. Gong-Bo Zhao and Yuting Wang. He is currently a research assistant at NAOC due to an unexpected disruption between grad school and postdoc. Ruiyang is working in the field of galaxy clustering cosmology, he is interested in using galaxy spectroscopic surveys to measure the expansion history and structure growth of the Universe. Ruiyang is heavily involved in the DESI collaboration, contributing to several key projects.

Host: Cheng Zhao