Studies report that structural axes or polarization angles of radio-loud AGN and quasars are coherently aligned over hundreds of Mpc, and radio-source dipoles can exceed the kinematic CMB-dipole expectation (Hutsemékers 2005; Tiwari & Jain 2015; Blinov 2020; Secrest 2021). Mandarakas et al. 2021 detected VLBI 3D jet alignment at 400-900 Mpc at greater than 99.5% significance. Such large-scale preferred directions sit uneasily with ΛCDM statistical isotropy.
The standard model assumes statistical isotropy of cosmic structure with only mild local-environment alignment from tidal-torque coupling at scales below 30-50 Mpc. Coherent gigaparsec-scale alignments demand either unknown systematics, unusual large-scale structure, or new physics, none 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, gigaparsec-scale radio + quasar VLBI jet axis alignments are direct shared-cascade-J inheritance signatures. The original collision deposited angular momentum J = μ(b × v_rel) into our patch (P22, P31, P32), and that vector propagates coherently from the largest cascade scales (Λ_max ≈ 5 Gpc) down to AGN spin axes through the cosmic-web filament network and the cascade-stream J-inheritance hierarchy (P34).
AGN host galaxies that condensed within cascade-stream filaments inherit the bulk J of their parent stream, and the central SMBH spin axes (which determine the radio jet directions) align with the inherited J vector. Multiple AGN drawing from the same cascade-stream parent context therefore share a common axis orientation across hundreds of Mpc to gigaparsec scales (P55, P57). The Mandarakas + Hutsemékers detections at 400 to 1000 Mpc match the SCT prediction at the calibrated cascade-stream J-coherence amplitude.
The CMB dipole geometric constraint P64 (J perpendicular to b, with v_frame parallel to b) places the radio + quasar alignment axis perpendicular to the CMB dipole direction. The same M3 framework that produces galaxy spin alignments along filaments (recid 83), satellite-plane co-rotation (recid 130), filament vorticity (recid 83), and the broader cascade-J cosmic-web phenomenology accounts for the radio + quasar axis alignments. There is no need to abandon the cosmological principle or to invoke unknown systematics at the cascade-J calibrated coherence amplitude.
If precision SKA + ngVLA + future VLBI surveys find AGN axis alignments uncorrelated with cascade-stream J vectors at greater than 3σ or unable to align with the CMB-dipole-perpendicular geometric constraint, the M3 shared-cascade-J inheritance is refuted. The signature SCT prediction is the alignment axis matching the cascade-stream J inheritance from the parent cosmic-web context plus alignment perpendicular to the CMB dipole.