On the Emergent Origin of Temporal Direction from Coherence Transport in Structured Spacetime

The origin of the arrow of time remains one of the most persistent foundational problems in theoretical physics. Although the fundamental laws governing classical mechanics, quantum field theory, and general relativity are largely time-reversal invariant, physical phenomena exhibit pronounced temporal asymmetry. This work proposes a structural reframing in which time is not treated as a primitive parameter, but as an emergent ordering relation arising from irreversible coherence transport through globally structured spacetime. Within this framework, coherence degradation under geometric and topological constraints induces a preferred temporal direction without modification of local dynamical laws. Entropy increase appears as a secondary, coarse-grained manifestation of the same underlying process. The approach preserves local time-reversal symmetry while explaining macroscopic irreversibility as a consequence of global transport constraints. Observer-dependent descriptions are reconciled through viewpoint limitations without invoking relativism or consciousness-based mechanisms. Mathematical foundations, physical consequences, limitations, and avenues for empirical falsification are discussed. The perspective adopted is native to Unified Structural Theory vΩ (UST vΩ), presented as a mathematically grounded, testable framework rather than a closed doctrine. The work is intended as a contribution toward structural clarity and continued investigation into the physical origins of temporal direction.