Mass–Energy, Chain Reactions, and Space-Phase Sequestration: An SP3 Reinterpretation of 𝐸 = 𝑚𝑐 2

Einstein’s mass–energy equivalence, E = mc², established that mass corresponds to animmense reservoir of energy, while twentieth‑century nuclear physics demonstrated thatchain reactions provide a practical mechanism for releasing a fraction of that energy.However, neither framework specifies where this energy physically resides prior to release,nor why its liberation exhibits abrupt, threshold‑driven behavior across widely differentscales.In this work, mass–energy equivalence is reinterpreted within the SP3 (space‑phase–structured space) framework, which treats space as an active, conditionable mediumrather than a passive background. Within SP3, mass corresponds to a persistentconditioning of surrounding space‑phase, and the energy associated with mass is largelysequestered in this conditioned spatial structure rather than localized solely withinparticles or fields. Nuclear chain reactions are reinterpreted as cooperative relaxationevents of over‑conditioned space‑phase, analogous to phase transitions rather than purelymechanical rearrangements.The inclusion of Appendix A extends this interpretation by explicitly comparing microscopicchain‑reaction nuclear explosions with macroscopic energy release via relativistic jetsfrom black‑hole systems. Despite vast differences in scale and geometry, both phenomenaare shown to share a common SP3 structure: long‑term energy sequestration inconditioned space‑phase followed by threshold‑triggered discharge. Nuclear explosionsrepresent abrupt, isotropic failure of space‑phase stability at microscopic scales, whileblack‑hole jets represent regulated, collimated release from cosmic‑scale space‑phasereservoirs.