Dust-to-gas ratios in galaxies show significant scatter at fixed metallicity, with some galaxies dust-rich and others dust-poor relative to standard models (Rémy 2017; Wolfire 2003). The variation across environments and cosmic epochs shows patterns inconsistent with simple metallicity-driven models, suggesting dust formation/survival involves physics beyond the standard equilibrium dust cycle.
The standard model has dust-to-gas ratios scale with metallicity through equilibrium stellar-nucleosynthesis dust production and destruction. Recovering the observed scatter and environmental variation demands non-equilibrium dust processes or modified stellar dust-yield models, neither of which is parsimonious within minimal ΛCDM.
SCT replaces the hot-dense-center with a superluminal collision and the thermalized debris field. From this single change, dust-to-gas ratio variations come from cascade-dust + gas heterogeneity inherited from prior cycles plus in-cycle stellar + AGN dust production. Pre-existing matter from prior cycles (P25, P28) supplies dust + gas populations with chemical and structural diversity beyond standard hierarchical-galaxy expectations; cascade-thermalized matter retains some inherited dust-precursor budget.
In-cycle stellar-population diversity from cascade-seeded structure evolution (P22, P34, P46) contributes to ongoing dust production through standard stellar nucleosynthesis on cascade-thermalized gas. Cascade-seeded SMBH (P46) drive AGN-fueled dust production through accretion + outflow processes. The combined inherited + in-cycle dust populations propagate to present-day dust-to-gas variations across galaxies and environments.
Angular-momentum inheritance (P31, P32) gives the dust-rich vs dust-poor populations their cascade-stream-J-aligned spatial distribution. Gravitational superposition (P50, P51, P52) provides the cosmic-web context where dust populations sit. The same M11 framework that resolves the FIRB excess (recid 158), the metallicity floor (recid 125), the diffuse gamma-ray background (recid 157), and the broader cascade-population phenomenology accounts for dust-to-gas ratio variations as multi-component cascade-context signatures.
If precision JWST + ALMA + Roman dust surveys find dust-to-gas ratios fully consistent with standard equilibrium stellar-nucleosynthesis predictions at the 5% level (no inherited cascade-dust signature, no cascade-stream-environment correlation), the M11 explanation is refuted. The signature SCT prediction is dust-to-gas variations correlating with cascade-stream environment + cascade-seeded SMBH AGN-history.