Disk-galaxy bar fractions decline toward higher redshift in ΛCDM expectations, yet dynamically mature long bars already exist at z ≈ 1 to 3 (Sheth 2008; Melvin 2014). ΛCDM simulations either predict too many strong bars at low z or require finely tuned disk stability, gas fractions, and merger histories to match the observed redshift evolution. The early appearance of substantial bars challenges hierarchical disk-formation expectations.
The standard model treats bars as fragile and transient, easily destroyed by mergers and the hot kinematics of early disks. Bar formation should proceed late (z < 1) with bars rare at high z. The observed substantial bar fraction at z = 1 to 3 demands either resilience-enhancing modifications to disk dynamics or fine-tuned merger-suppression at high z, 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, cascade-stage proto-galaxies inherit J/J_circ ratios at seeding (P22, P25, P31, P32), so spirals exist with developed disks early. The cascade impact-parameter distribution P(b) ∝ b deposits the J inheritance that gives disk morphology directly at deposition rather than after hierarchical assembly.
Reduced halo-disk coupling from gravitational superposition (P50, P51, P52, P54) enables bar formation more easily and persistence longer than ΛCDM predicts: the Φ_mesh contribution provides the gravitational binding without the cuspy CDM halo whose strong baryon-DM coupling would destabilize bars. The resulting bar fraction is approximately constant at z = 0 to 4 at roughly 20 to 30%, reflecting the fraction of cascade-stream events with the appropriate J/J_circ ratio for disk-bar morphology.
Pre-existing matter from prior cycles (P25) gives the cascade-deposited disk gas content that fuels the bar instability dynamics. The same M3 framework that produces galaxy spin alignments (recid 83), bulge-disk decoupling (recid 114), morphology evolution stall (recid 117), and the abundant high-z thin disks accounts for the bar-fraction puzzle. Bars are stable structures inherited at cascade-deposition, not transient features built by hierarchical processes.
If precision JWST + Euclid + Roman bar-fraction surveys at z > 2 find bar fractions consistent with the ΛCDM late-formation prediction (factor-of-3-to-5 decline by z = 2, no settled long-bar population at high z), the M3 cascade-inheritance bar explanation is refuted. The signature SCT prediction is bar fractions roughly constant at 20 to 30% from z = 0 to z = 4.