Dynamical Dark Energy and Modified Gravity Results from DESI and other cosmological datasets: Persistent Challenges to the Cosmology Standard Model.

ORAL

Abstract

I will present cosmology results from the Dark Energy Spectroscopic Instrument (DESI) measurements of the Baryon Acoustic Oscillations (BAO) and the full shape galaxy power spectrum in combination with other cosmological datasets. The results particularly include new stringent constraints on the dark energy equation of state, the Hubble parameter, spatial curvature, and neutrino mass. Dark Energy results indicate a time evolving equation of state and are in tension with the cosmological constant of the standard model of cosmology. Also, results about testing deviations from the general relativity theory of gravity will be presented. I conclude with some brief comments on implications from our results.

*Work supported by the Department of Energy, Office of Science, and the U.S. National Science Foundation Astronomy and Astrophysics program.

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Publication: A.G. Adame et al. for the DESI Collaboration. "DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman alpha forest." Journal of Astroparticle Physics and Cosmology 01 (2025) 124.
M. Ishak et al. for the DESI Collaboration. "Modified Gravity Constraints from the Full Shape Modeling of Clustering Measurements from DESI 2024." e-Print: 2411.12026 [astro-ph.CO]. Accepted and at press at Journal of Cosmology and Astroparticle Physics.
DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints, DESI Collaboration: M. Abdul-Karim,et al. 2025. Physical review D, at Press 2025.

Presenters

  • Mustapha Ishak

    • University of Texas at Dallas

Authors

  • Mustapha Ishak

    • University of Texas at Dallas