Electron Interference from Internal Geometry: Two-Kernel SU(2) Structure, Quartic Energy Flow, and an Intrinsic Visibility Limit

[38 Application] Summary This paper derives a universal upper limit on electron interference visibility — ⟨V⟩ = √2 − 1 ≈ 0.414 — from the internal geometry of the electron alone, without free parameters or environmental assumptions. The result follows from a two-kernel internal structure at the Compton scale, in which energy circulates between two geometric components under a quartic identity. When internal phases are not externally controlled, ensemble averaging over all phase configurations yields this bound as an intrinsic structural ceiling. A key implication: this limit applies to electrons but not to photons, predicting a measurable asymmetry between the two types of interference. This distinction is…