2024/05/27 by Arianna Favale, Adrià Gómez-Valent, Favale, Arianna +3
Earth and Planetary Sciences · Physics and Astronomy · #Astronomy and Astrophysical Research #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Geophysics and Gravity Measurements
paper · pdf · doi:10.48550/arxiv.2405.17643
openalex publication_date 2024/05/27 · openalex created_date 2024/05/30 · openalex updated_date 2026/07/28
Looking at the well-known Hubble tension as a tension in the calibrators of the cosmic distance ladder, i.e. the absolute magnitude M of standard candles such as supernovae of Type Ia (SNIa) and the standard ruler represented by the comoving sound horizon at the baryon-drag epoch, rd, we propose a model-independent method to measure these distance calibrators independently from the cosmic microwave background and the first rungs of the direct distance ladder. To do so, we leverage state-of-the-art data on cosmic chronometers (CCH), SNIa and baryon acoustic oscillations (BAO) from various galaxy surveys. Taking advantage of the Gaussian Processes Bayesian technique, we reconstruct M(z), Ωk(z) and rd(z) at z\lesssim2 and check that no significant statistical evolution is preferred at 68% C.L. This allows us to treat them as constants and constrain them assuming the metric description of gravity, the cosmological principle and the validity of CCH as reliable cosmic clocks, and SNIa and BAO as optimal standard candles and standard rulers, respectively, but otherwise in a model-independent way. We obtain: Ωk=-0.07+0.12-0.15, M=(-19.314+0.086-0.108) mag and rd=(142.3± 5.3) Mpc. At present, the uncertainties derived are still too large to arbitrate the tension but this is bound to change in the near future with the advent of upcoming surveys and data.