DESI: Overview and the Latest Cosmological Results from Clustering Measurements

ORAL  · Invited

Abstract

The Dark Energy Spectroscopic Instrument (DESI) is mapping the three-dimensional distribution of galaxies and quasars to trace the Universe's expansion history and the growth of structure, enabling precision tests of dark energy and gravity. Over its eight years survey, DESI is expected to obtain approximately 63 million spectroscopically-confirmed spectra, delivering high-precision constraints on key cosmological parameters across a broad redshift range and multiple tracers. In this talk, I will give a brief overview of DESI and summarize the main cosmological results obtained so far. I will also provide status updates on Data Release 2 (DR2), with particular focus on the developments on the full-shape analysis side, including methodological refinements and analysis choices informed by the expanded dataset. I will conclude with an outlook on next steps, including forthcoming analyses, and the path toward increasingly stringent tests of the standard cosmological model.

*This material is based upon work supported by the U.S. Department of Energy (DOE), Office of Science, Office of High-Energy Physics, under Contract No. DE–AC02–05CH11231, and by the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility under the same contract. Additional support for DESI was provided by the U.S. National Science Foundation (NSF), Division of Astronomical Sciences under Contract No. AST-0950945 to the NSF's National Optical-Infrared Astronomy Research Laboratory; the Science and Technology Facilities Council of the United Kingdom; the Gordon and Betty Moore Foundation; the Heising-Simons Foundation; the French Alternative Energies and Atomic Energy Commission (CEA); the National Council of Humanities, Science and Technology of Mexico (CONAHCYT); the Ministry of Science, Innovation and Universities of Spain (MICIU/AEI/10.13039/501100011033), and by the DESI Member Institutions: ​https://www.desi.lbl.gov/collaborating-institutions.

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Presenters

  • Jiamin Hou

    • University Observatory, Faculty of Physics, Ludwig-Maximilians-Universität München, Scheinerstraße 1, 81679 München, Germany

Authors

  • Jiamin Hou

    • University Observatory, Faculty of Physics, Ludwig-Maximilians-Universität München, Scheinerstraße 1, 81679 München, Germany