
This theorem proves that universal gravitational coupling is not an independent postulate but a structural consequence of closure. Any selective, screened, or composition-dependent coupling is shown to introduce forbidden intrinsic structure or violate sectorwise admissibility. The result is classificatory and independent of geodesic motion, test-body arguments, or phenomenology.
equivalence principle, gravitational closure, universal coupling, classical gravity, structural rigidity, quadratic closure, admissibility, response sectors, symmetry exhaustion, no-go theorem, modified gravity, screening mechanisms
equivalence principle, gravitational closure, universal coupling, classical gravity, structural rigidity, quadratic closure, admissibility, response sectors, symmetry exhaustion, no-go theorem, modified gravity, screening mechanisms
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