PIRSA:26010078

Video URL

https://pirsa.org/26010078

Cosmological Inference from LSS in DESI

(2026). Cosmological Inference from LSS in DESI. Perimeter Institute for Theoretical Physics. https://pirsa.org/26010078

Cosmological Inference from LSS in DESI. Perimeter Institute for Theoretical Physics, Jan. 20, 2026, https://pirsa.org/26010078 

          @misc{ scivideos_PIRSA:26010078,
            doi = {10.48660/26010078},
            url = {https://pirsa.org/26010078},
            author = {},
            keywords = {Cosmology},
            language = {en},
            title = {Cosmological Inference from LSS in DESI},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2026},
            month = {jan},
            note = {PIRSA:26010078 see, \url{https://scivideos.org/pirsa/26010078}}
          }
Mark Maus
Talk numberPIRSA:26010078
DOI10.48660/26010078
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

The Dark Energy Spectroscopic Instrument (DESI) is the largest galaxy redshift survey to date, aiming to catalog ~63 million galaxies over 17000 deg^2 of the sky by the end of 8 years of observation. The DR1 analyses were completed in 2024 with exciting new constraints on cosmological parameters within the standard LCDM model as well as extensions such as evolving dark energy. I will discuss the cosmological results from the DR1 fullshape and BAO analysis which was presented in the Fall of 2024 and the theory systematic tests/validation that went into it. I will then discuss the advantages of including cross correlations of DESI galaxies with CMB lensing and some key results from my joint analysis of 3D clustering with CMB lensing using the DESI DR1 galaxy sample and ACT DR6 and Planck PR4 lensing maps. In particular we find that just including galaxy-lensing cross-correlations on top of the fullshape and BAO analysis tightens amplitude constraints by ~30%. The second data release (DR2) spans three years of observation with analyses expected to be presented in Spring of 2026. I will briefly discuss the expected improvements in constraining power from DR2 and summarize the types of analyses that DESI will perform and their cosmological relevance.