PIRSA:25120022

Video URL

https://pirsa.org/25120022

Measuring the Hubble Constant Without the Sound Horizon: A New Constraint from DESI

Zaborowski, E. (2025). Measuring the Hubble Constant Without the Sound Horizon: A New Constraint from DESI. Perimeter Institute for Theoretical Physics. https://pirsa.org/25120022

Zaborowski, Erik. Measuring the Hubble Constant Without the Sound Horizon: A New Constraint from DESI. Perimeter Institute for Theoretical Physics, Dec. 02, 2025, https://pirsa.org/25120022 

          @misc{ scivideos_PIRSA:25120022,
            doi = {10.48660/25120022},
            url = {https://pirsa.org/25120022},
            author = {Zaborowski, Erik},
            keywords = {Cosmology},
            language = {en},
            title = {Measuring the Hubble Constant Without the Sound Horizon: A New Constraint from DESI},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2025},
            month = {dec},
            note = {PIRSA:25120022 see, \url{https://scivideos.org/pirsa/25120022}}
          }

Erik Zaborowski Ohio State University

Talk numberPIRSA:25120022
DOI10.48660/25120022
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

The Hubble tension, recently reaching as high as 7σ, increasingly presents a challenge to the ΛCDM model. A key question is whether this tension stems from our use of the sound horizon as a standard ruler. In this talk, I will present a new, sub-2% measurement of the Hubble constant (H₀) that is independent of the sound horizon scale, using data from the first data release of the Dark Energy Spectroscopic Instrument (DESI). The analysis employs a power spectrum rescaling technique that marginalizes over the sound horizon information, drawing instead on the matter-radiation equality scale as a standard ruler. Combining DESI’s full-shape galaxy clustering with uncalibrated post-reconstruction BAO and the CMB acoustic scale θ*, along with various external sound horizon-free datasets, results in highly robust constraints that are the most precise to date from LSS. Looking ahead, this measurement offers a new window on beyond-ΛCDM physics and the physical origin of the Hubble tension.