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Velocities in stable circular orbits about galaxies, a measure of centripetalgravitation, exceed the expected Kepler/Newton velocity as orbital radiusincreases. Standard LCDM attributes this anomaly to galactic dark matter.McGaugh et al have recently shown for 153 disc galaxies that observed radialacceleration is an apparently universal function of classical accelerationcomputed for observed galactic baryonic mass density. This is consistent withthe empirical MOND model, not requiring dark matter. It is shown here thatsuitably constrained LCDM and conformal gravity (CG) also produce such auniversal correlation function. LCDM requires a very specific dark matterdistribution, while the implied CG nonclassical acceleration must beindependent of galactic mass. All three constrained radial accelerationfunctions agree with the empirical baryonic $v^4$ Tully-Fisher relation.Accurate rotation data in the nominally flat velocity range could distinguishbetween MOND, LCDM, and conformal gravity.

Theoretical implications of the galactic radial acceleration relation of McGaugh, Lelli, and Schombert