Regime-Level Viability of String-Theoretic Unification Under Non-Equilibrium Physical Constraints

This study evaluates string theory from a regime-level perspective, testing whether a string-theoretic framework can exist as a single, globally self-consistent physical regime when subjected simultaneously to quantum, relativistic, and cosmological constraints under non-equilibrium evolution. Rather than proposing a specific microscopic construction or vacuum realization, the analysis focuses on structural viability: invariance, causal organization, robustness, and consistency across scales. A structure-aware diagnostic framework is employed to enforce gauge invariance, Lorentz covariance, anomaly cancellation, renormalization consistency, vacuum stability, energy conservation, and causal ordering, while anchoring the system to recoverability of known effective physical laws. Extensive control ensembles—including null-structure tests, symmetry-breaking perturbations, parameter randomization, and multi-order-of-magnitude noise sweeps—are used to distinguish intrinsic organization from numerical or statistical artifacts. Across all perturbation regimes, the system converges to a stable emergent organizational phase with invariant global topology, high structural stability, and coherent causal structure. While this work does not derive a complete Theory of Everything, it establishes necessary regime-level conditions for unification without contradiction and outlines a concrete pathway toward invariant extraction, effective field projection, and falsifiable prediction.