USP Light Foundations: Filtering, Polarization, Corridor Geometry, and Δf Spin Torque (msf:47341 v2.3)

This document presents the unified foundation of USP optical behavior, showing how filtering, polarization, birefringence, and Faraday rotation all arise from the same physical mechanism: corridor geometry within matter.In USP Field Theory, light does not carry intrinsic polarization or color. Instead, the material lattice defines which modes can propagate. This produces mode selection (polarization), wavelength-selective transmission (filtering), and magnetic-field-induced rotational shifts (Faraday rotation).The work introduces Δf-based propagation constants, corridor-dependent attenuation, and spin-torque asymmetry as a complete optical framework. Predictions include metamaterial corridor-rotation effects, Faraday scaling deviations, and atmosphere-based Δf re-emission.