Empirical Validation of Phase-Shift Cosmology: A First-Order Geometric Scale Correction Against Type Ia Supernova Data

Modern consensus cosmology relies on dynamic space-expansion metrics and arbitrary parameters to reconcile high-redshift observations, introducing a severe 120-orders-of-magnitude fine-tuning paradox within the quantum vacuum. This paper documents the first empirical verification of Phase-Shift Cosmology, an alternative framework that eliminates these structural abnormalities by operating within a flat, non-expanding geometric manifold substrate. Under this architecture, deep-space galactic redshift (z) is modeled not as coordinate stretching, but as an intrinsic, distance-dependent phase shift experienced by propagating light waves interacting with native, harmonic vacuum boundary conditions governed by a Helmholtz wave relation. Using the gold-standard Pantheon+SH0ES Type Ia Supernova compilation, we execute a rigorous regression analysis applying a conservative, first-order Taylor series spatial scale correction directly to our linear baseline distance within the geometric propagation term. The scale-corrected distance modulus equation yields optimized parameters, achieving a highly responsive total of 745.43 and a Reduced Chi-Squared value of 0.439. These results demonstrate that a stable, classical Minkowski metric—utilizing elegant mathematical foundations fully established by 1908 or before—remains entirely capable of tracking premier cosmological datasets without the injection of unverified placeholders like Dark Energy or Dark Matter. Crucially, this framework unifies macro-scale astronomical observations and micro-scale quantum vacuum regulations under the exact same underlying phase-shift mechanism.