In warped extra-dimension scenarios the crossover radius to four-dimensional gravity can lie far above atomic scale

The claim is modal: it asserts that warped scenarios permit a crossover radius far above atomic scale, not that the radius actually is large. Two things establish it. First, the load-bearing theoretical premise, that the Randall-Sundrum single-brane model recovers four-dimensional Newtonian gravity above the AdS curvature radius↗︎, is the founding result of the RS2 model (Randall and Sundrum, Phys. Rev. Lett. 83, 4690, 1999): corrections to the Newtonian potential scale as the square of the curvature radius over distance, so gravity is four-dimensional well above that radius and five-dimensional below it. The original paper already noted the radius could be nearly macroscopic. Second, the supporting empirical premise: torsion-balance experiments bound extra-dimensional corrections to Newton's law to sub-millimeter scales↗︎. A current review of short-range inverse-square-law tests (arxiv.org/html/2605.18212v1) confirms the leading torsion-balance measurements reach minimum gaps near 52 micrometers, and published analyses constrain the RS curvature radius to below roughly 30 micrometers. Even the tightest such bound leaves an allowed window extending five to six orders of magnitude above the atomic scale (~0.1 nm). Both premises are settled physics; the arithmetic connecting them (30 μm versus 0.1 nm) is elementary. Credence is not 1 only because "warped extra-dimension scenarios" is a family of models and specific constructions can tie the curvature radius to shorter scales; but the claim needs only that the crossover radius can be large, which the canonical RS2 setup exhibits. New evidence that would change the verdict: experimental exclusion of inverse-square-law violations down to near-atomic scales, which is far beyond current technique.