Yi, Yunbeom: A Two-Scale de Sitter Identity for the Galactic Acceleration Threshold

The empirical acceleration scale that normalises the radial acceleration relation (RAR) is conventionally written as a0 ≃ 1.20 × 10−10 m s−2. It marks the scale at which the Newtonian acceleration inferred from the baryonic mass distribution no longer closes the observed galactic acceleration budget. It has long been noted that a0 lies close to clightH0/(2π), although the uncorrected Hubble-temperature scale undershoots the empirical value by about 13%. Working within a two-scale de Sitter cosmo