2024/11/18 by G. R. Ye, Ye, Gen · 8 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Solar and Space Plasma Dynamics
paper · pdf · doi:10.48550/arxiv.2411.11743
openalex publication_date 2024/11/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
It is found that a non-minimally coupled scalar tensor theory, Thawing Gravity (TG), can explain multiple tensions plaguing the standard cosmological model ΛCDM while fitting better to observations than the latter. Using the standard Bayes model comparison method, TG has moderate evidence over ΛCDM with a Bayes factor ln B=+1.5 in the baseline analysis including CMB, BAO and SNIa. In the baseline+H0 analysis which further takes into account the Cepheids calibration of the SNIa distance ladder from SH0ES, TG has very strong evidence over ΛCDM with ln B=+11.8. In particular, TG yields H0=71.78±0.86 \rm km/s/Mpc and S8=0.793±0.012, consistent with both the local H0 measurement and the large scale structure surveys. TG predicts a prerecombination Newtonian constant G\rm CMB different from today's value GN. A ∼2σ hint for G\rm CMB/GN>1 is recovered in the baseline analysis with CMB+BAO+SNIa, which becomes a >4σ detection when one further takes into account the local H0 measurement. The obtained G\rm CMB/GN is consistent with current BBN constraint and can be tested by future observations.