WMAP and Planck data indicate Galactic synchrotron emission is more depolarized in the Galactic plane than standard Faraday rotation and turbulence models predict (Planck 2016; Pasetto 2018). Beam + depth depolarization explain some of it; the residual implies either unexpectedly high small-scale magnetic turbulence or distinct Faraday-thick ISM component not in current foreground templates.
The standard model has Galactic synchrotron + Faraday rotation in turbulent magnetic field. Recovering the observed depolarization residuals demands either enhanced small-scale turbulence (beyond standard MHD predictions) or unaccounted Faraday-thick ISM components, neither of which is parsimonious within the standard framework.
SCT replaces the hot-dense-center with a superluminal collision and the thermalized debris field. From this single change, synchrotron depolarization comes from cascade-magnetic-field generation in our cycle by cascade-seeded compact-object dynamics plus standard Galactic structural physics. Pre-existing matter (P25, P28) supplies the gas + magnetic-field-precursor populations inherited from prior cycles; cascade-seeded SMBH (P46) drove magnetic-field amplification through accretion + outflow processes throughout cosmic history.
The cascade-magnetic-field structure includes additional small-scale turbulence components beyond standard MHD predictions because cascade-stream filament dynamics generated B-field topology that propagates through to the present-day Galactic ISM (cross-link to recid 223 IGM magnetogenesis). Angular-momentum inheritance (P31, P32) gives the magnetic-field topology its J-aligned spatial variations that produce the depolarization-canal patterns observed.
Gravitational superposition (P50, P51, P52) provides the cosmic-web context that holds the Galactic magnetic-field structure together. The combined cascade-magnetic-field topology + standard synchrotron emission physics produce the observed depolarization residuals without requiring enhanced small-scale turbulence beyond MHD or unaccounted Faraday-thick components. The same M11 framework that resolves the diffuse gamma-ray background (recid 157), the radio-loop foregrounds (recid 161), the Galactic plane emission residuals (recid 202), and the broader cascade-population phenomenology accounts for synchrotron depolarization.
If precision SKA + ngVLA + LOFAR-2.0 polarized-synchrotron surveys find Galactic depolarization fully consistent with standard Faraday + MHD-turbulence predictions at the 5% level (no cascade-magnetic-field topology signature), the M11 explanation is refuted. The signature SCT prediction is depolarization patterns matching the cascade-magnetic-field structure inherited from cascade-stream + cascade-seeded compact-object dynamics.