High-redshift quasars (z > 2 to 3) exhibit unexpectedly strong spatial clustering and overdensity signals compared to ΛCDM predictions. Quasars appear to inhabit more massive dark-matter halos than expected, or their formation is biased toward overdense regions more strongly than the standard model accommodates (Stiavelli & Treu 2010; Eftekharzadeh 2015). The clustering amplitudes and inferred halo masses are inconsistent with hierarchical assembly timescales and halo growth rates.
The standard model has high-z quasars residing in CDM halos that grow hierarchically. Recovering the observed clustering excess demands either anomalously fast halo growth or quasar formation strongly biased toward overdense regions, both of which require fine-tuning the standard hierarchical-assembly + AGN-formation models.
SCT replaces the hot-dense-center with a superluminal collision and the thermalized debris field. From this single change, high-z quasar clustering excess comes from cascade-seeded SMBH plus cascade-stream geometry signature. Cascade-seeded SMBH (P46) inherited from prior cycles (P25, P28) populate the cosmic-web filament network (P34) at the cascade-deposition epoch with the substantial 10⁷ to 10⁹ M☉ mass range (recid 109).
Quasars at high z form preferentially within cascade-stream filament environments where cascade-seeded SMBH have access to abundant gas inflow from the cascade-deposited filament-stream baryon reservoirs. The clustering excess therefore reflects the cascade-stream cosmic-web geometry: quasars cluster strongly because they sit within the same cascade-deposited filament infrastructure (P34, P55), with the gigaparsec-scale coherence inherited from the cascade-stream J distribution (P31, P32).
Angular-momentum inheritance (P31, P32) gives coherent quasar clustering across multi-Gpc scales (cross-link to recid 162 quasar polarization 1 Gpc coherence; recid 103 large quasar groups). The inferred halo masses are larger than ΛCDM hierarchical-assembly predicts because the cascade-deposited gravitational environment of these quasars includes the Φ_mesh contribution (P50, P52) on top of the local baryonic mass. The same M1 framework that resolves the JWST early-galaxy mass crisis (recid 7, 108), the SMBH-seed problem (recid 109), the merger-rate decline (recid 110), and the broader high-z cascade-seeded structure phenomenology accounts for high-z quasar clustering.
If precision LSST + Euclid + Roman + SKA high-z quasar surveys find clustering fully consistent with hierarchical-galaxy assembly + standard AGN-formation predictions at the 5% level (no cascade-stream-filament-coherence signature), the M1 cascade-seeded explanation is refuted. The signature SCT prediction is the clustering tracking the cascade-stream cosmic-web geometry rather than ΛCDM-halo-mass-only predictions.