https://doi.org/10.1140/epjc/s10052-025-14219-5
Regular Article - Theoretical Physics
Effect of peak absolute magnitude of Type Ia supernovae and sound horizon values on the Hubble constant using DESI Data Release 1 results
Department of Physics, IIT, Kandi, 502284, Hyderabad, Telangana, India
Received:
3
March
2025
Accepted:
22
April
2025
Published online:
29
April
2025
We apply data-motivated priors on the peak absolute magnitude of Type Ia supernovae (M) and the sound horizon at the drag epoch (
), to study how the
degeneracy affects low redshift measurements of the Hubble constant, and then compare these estimates to the Planck estimated value of the Hubble constant. We use the data from Pantheon
, Cosmic Chronometers, and the Dark Energy Spectroscopic Instrument Data Release 1 (DESI DR1) Baryon Acoustic Oscillations (BAO) results for this purpose. We reaffirm the fact that there is a degeneracy between M and , and modifying the values to reconcile the discrepancy in Hubble constant values also requires a change in the peak absolute magnitude M. For certain M and priors, the discrepancy is found to reduce to be as low as (1.2–2) 
when considering the spatially flat
CDM model. We also notice that for our datasets considered, the Gaussian prior combination of 
(obtained from SH0ES) and 
Mpc (determined from Planck CMB measurements) is least favored as compared to other prior combinations for the CDM model.
© The Author(s) 2025
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Funded by SCOAP3.
