Cosmological Constraints from the DESI Measurements of Baryon Acoustic Oscillations

ORAL  · Invited

Abstract

The Dark Energy Spectroscopic Instrument (DESI) is conducting a five-year program to measure the effect of dark energy on the expansion of the Universe and the growth of structure within it. It is the first of the new generation of so-called stage IV cosmological surveys, and will obtain optical spectra for tens of millions of galaxies and quasars. I will present the latest cosmological results derived from the DESI measurements of baryon acoustic oscillations, including constraints on the expansion rate of the Universe, the dark energy equation of state, and upper bounds on the sum of neutrino masses. I will contrast these results with those obtained from previous datasets and show results in combination with cosmic microwave experiments and supernova surveys. These data provide a strong test of whether dark energy matches the predictions of Einstein's cosmological constant, Lambda. I will discuss the tests of this made possible by the latest data and present new results testing the standard model of cosmology, and setting the path forward to future DESI data analyses.

*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

  • Enrique Paillas

    • University of Arizona

Authors

  • Enrique Paillas

    • University of Arizona