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Two Barriers to the MOND Acceleration Coefficient: the de Sitter-Unruh Balance Is Orbital-Invariant at a0 = 2 c H_Lambda, and Rotation-Curve Determinations of a0 Are Definition-Limited at 30%

The MOND acceleration scale a0 is numerically close to c H_Lambda, and several authors have proposed that it is set by the cosmological constant. The relation's form is established (Milgrom 1994, 1999, 2020); its dimensionless O(1) coefficient is not derived by any published argu...

The MOND Acceleration Scale as a de Sitter Curvature Scale: Gauged SO(4,1) Gravity Reduces a0 = c^2 sqrt(Lambda/32pi) to a Single Free Number

Galaxy dynamics organize around an acceleration scale a0 ~ 1e-10 m/s^2 that numerically coincides with c*sqrt(Lambda) and cH0. This paper develops the hypothesis that the coincidence is structural -- that a0 is a de Sitter curvature scale, a0 = c^2*sqrt(Lambda/32pi) = (c/2)*sqrt(...