Four‑Forces Unification Framework: Origin of Matter‑Antimatter and Intrinsic Mechanism of Annihilation Energy

While modern physics can accurately calculate the energy values of matter‑antimatter annihilation, it cannot answer three fundamental questions: why do matter and antimatter inevitably annihilate each other? What is the real source of annihilation energy? What is the internal dynamic mechanism for the conversion of mass into energy? Based on the evolution of spacetime curvature at black‑hole event horizons, dimension‑breaking energy and the splitting of spacetime directions, this paper constructs a self‑consistent original physical model. This paper demonstrates that gravity is the fundamental source of the universe, and all external forces originate from gravity. The fall of matter toward a black‑hole event horizon corresponds to the process of dimension ascension. The closed‑horizon structure can split into independent sub‑universes. Spacetime‑curvature cracking inside the event horizon generates bidirectional spacetime directions and produces pairs of matter and antimatter. The essential nature of Coulomb force lies in the spacetime causal tendency toward convergence of matter‑antimatter pairs. The weak force is gravity within quantum space. Matter‑antimatter annihilation is not a spontaneous quantum effect, but an evolutionary result of spacetime regression toward zero at singularities. This paper completes four‑item accurate decomposition of annihilation energy, and unifies the intrinsic correlations among gravitational potential energy, Coulomb potential energy, mass‑energy, dimension‑ascension breaking energy and neutrino‑pair potential energy. From the perspective of spacetime geometry and gravity sources, it fully explains the underlying physical nature of the origin, interaction and annihilation energy of matter‑antimatter, and provides theoretical basis for the stable formation of protons and neutrino capture schemes.