Double-Slit Interference in USP Field Theory: Coherent Δf Corridors, Detector Coupling, and Testable Deviations

This document presents a strengthened USP Field Theory interpretation of the double-slit experiment. The work reframes photon and electron interference as coherent propagation through accessible Δf resonance corridors, with measurement described as localized detector coupling rather than wavefunction collapse. The v1.2 edition expands the earlier msf:52060 framework by making detector physics central. The model introduces a detector kernel K(r − r0), detector resolution σ, linewidth Γ, coherence time τ, phase shift δφ, and fringe visibility V as operational quantities that can be measured and calibrated. The paper preserves standard interference results in the appropriate limit while proposing USP-specific experimental distinctions through detector dependence, controlled detuning, and phase-shift behavior. The central interpretation is that the observed interference pattern is distributed, while each detection event is localized by resonance-compatible coupling between the oscillatory structure and the detector. For photons, the pattern arises from coherent Δf corridor propagation. For electrons, the electron is interpreted as a spatially extended stationary oscillatory mode whose local detection probability is governed by convolution with the detector kernel. The paper includes protocols for testing phase shift without decoherence, detuning-controlled visibility, detector-kernel scaling, and frequency-dependent phase sensitivity. It also adds reporting requirements, example parameter ranges, detector calibration guidance, falsification thresholds, statistical methods, and a synthetic-data simulation outline. The key USP relation used in the document is: I(x) = κI |C[Δf1(x,t) + Δf2(x,t)]|² and the localized detection model is: Pdet(r0) ∝ ∫ u(r) K(r − r0) d³r The document is compatibility-first: it does not reject quantum mechanics or modify confirmed double-slit results. Instead, it proposes a mechanism-level resonance interpretation with measurable and falsifiable extensions. The earlier v1.1 version already introduced Δf corridors, detector kernels, phase shift, visibility scaling, and statistical analysis; v1.2 strengthens these into a more explicitly USP-centered and experimentally actionable form.