Cosmological Gravitation as an Inverse Reaction to Expansion

We propose a new theory of gravitation in which gravity is not merely a local interaction between masses but an inverse reaction to the expansion of the universe.The theory introduces a scale-dependent correction term that enhances gravitational strength in low-density environments such as galaxy halos and voids.The model explains flat galactic rotation curves, gravitational lensing in voids, early formation of SMBHs, and the Hubble tension — without requiring dark matter.It remains consistent with Solar System observations and is fully testable.This document contains the full theoretical formulation, test results, and comparisons to standard cosmology.