Papers › Hints for a gravitational constant transition in Tully-Fisher data
Hints for a gravitational constant transition in Tully-Fisher data
George Alestas, Ioannis Antoniou, Leandros Perivolaropoulos
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We use an up to date compilation of Tully-Fisher data to search for transitions in the evolution of the Tully-Fisher relation. Using an up to date data compilation, we find hints at ≈3σ level for a transition at critical distances D_c ≃9 Mpc and D_c ≃17 Mpc. We split the full sample in two subsamples according to the measured galaxy distance with respect to a splitting distance D_c and identify the likelihood of the best fit slope and intercept of one sample with respect to the best fit corresponding values of the other sample. For D_c ≃9 Mpc and D_c ≃17 Mpc we find a tension between the two subsamples at a level of Δχ² > 17 (3.5σ). Using a Monte-Carlo simulation we demonstrate that this result is robust with respect to random statistical and systematic variations of the galactic distances. If the tension is interpreted as due to a gravitational strength transition, it would imply a shift of the effective gravitational constant to lower values for distances larger than D_c by ΔG/G≃-0.1. Such a shift is of the anticipated sign and magnitude but at somewhat lower distance (redshift) than the gravitational transition recently proposed to address the Hubble and growth tensions (ΔG/G≃-0.1 at transition redshift zₜ≲0.01 (D_c≲40 Mpc)).
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