The Grand Unification of Electromagnetism and Gravity: Topological Torsion and Volumetric Contraction in the DDIC Spacetime Model

This paper presents a candidate framework for the grand unification of electromagnetism and gravity through the Density-Driven Internal Contraction (DDIC) spacetime model, and explores its implications for electromagnetic-gravitational phenomena. While Einstein's General Relativity describes gravity as smooth geometric curvature (Einstein, 1915; Misner, Thorne, Weinberg, 1995). The DDIC model bridges this divide by postulating a microscopic, cellular, and topological structure of spacetime itself. In this framework, gravity and electromagnetism are not independent forces but two distinct geometric deformations of the same universal crystalline lattice: gravity emerges as scalar volumetric contraction () of spacetime microcells, while electromagnetism arises as vectorial topological torsion () of the interconnecting links between cells. This paper presents the DDIC unification through differential geometric formalism, deriving the inverse-square law () from spherically symmetric propagation through the cellular spacetime lattice, and explaining the magnitude gap between the forces via micro-mechanical elastic moduli—where volumetric compression is extremely stiff and link torsion is comparatively flexible. The model further offers a geometric origin for the wave-particle duality of light, reinterpreting the photon as a propagating torsion wave that localizes as a topological soliton upon measurement. Unlike Kaluza-Klein or string theory, DDIC achieves unification without introducing extra spatial dimensions, relying instead on the intrinsic microcellular topology of spacetime. Finally, the framework predicts that antimatter experiences the same attractive gravity as matter—consistent with the CERN ALPHA-g experiment (Anderson et al., 2023)—with its electromagnetic properties determined by the sign of the torsion mode.