Unified Empirical Constraints on Scalar Temporal Flow Across Laboratory, Astrophysical, and Cosmological Scales

This work consolidates all current experimental and observational constraints on the Scalar Temporal Field Ontology (STFO) into a unified empirical synthesis. Bounds derived from solar cycle data, fast radio burst dispersion anisotropy, gravitational-wave propagation, and laboratory atom interferometry are translated into a common effective coupling space governing scalar temporal flow. Each independent channel constrains a different dynamical regime of the scalar temporal field, ranging from nonlinear tau-saturated stellar interiors to weak-gradient propagation and laboratory inertial response. The combined envelope demonstrates that present data force scalar temporal effects to remain strongly suppressed across all accessible scales, while leaving a narrow viable parameter region open for future tests. This work establishes the first complete multi-domain empirical bounding of scalar temporal flow as a physical field.