Numerical and observational studies of the cosmic web show vorticity in and around filaments is highly structured, often arranged in quadrants where rotation flips across filament branches and halo or galaxy spins change from aligned to perpendicular as mass or environment varies (Pichon & Bernardeau 1999; Codis 2015; Laigle 2015; Kraljic 2020). ΛCDM requires delicate coupling between irrotational flows, tidal-torque theory, shell crossing, and feedback to reproduce this pattern, and simulations do not robustly reproduce all the observed alignment transitions.
The standard model treats large-scale flows as initially irrotational with vorticity emerging only from non-linear processes. Branching vorticity with coherent flips at junction nodes demands carefully tuned non-linear coupling, 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, branching vorticity flips are direct cascade-stream J inheritance signatures at junction nodes. Each cosmic-web filament inherits bulk J from its parent cascade-stream event (P22, P31, P32). At junction nodes where multiple filaments meet, the contributing cascade-stream J vectors combine vectorially, producing the predictable vorticity-flip pattern.
The full cosmic web from collision geometry (P34) deposits filament populations whose J-orientation distribution follows the cascade impact-parameter geometry. Junction nodes are precisely where multiple cascade-stream events converge (recid 74 connectivity statistics), and the net vorticity at each junction is the vector sum of contributing filament J vectors. The flip pattern between branches reflects the sign-conventions of the contributing cascade-stream events: branches with parallel cascade-stream J vectors show aligned spin; branches with anti-parallel inheritance show flipped spin.
Pre-existing matter (P25) gives the gas + stellar diversity that visibly traces the vorticity pattern at the galaxy scale. Halo and galaxy spins change from aligned to perpendicular as mass or environment varies because J ∝ M^(5/3) (P32) makes large-mass and small-mass components inherit J from cascade events at different mass scales, naturally producing the mass-dependent alignment transitions observed. The same M3 framework that produces galaxy spin alignments along filaments (recid 83), filament vorticity (recid 83), and the broader cascade-J-axis cosmic-web phenomenology accounts for branching vorticity flips.
If precision DESI + Euclid + SKA cosmic-web vorticity mapping finds the flip pattern fully consistent with non-linear coupling predictions of ΛCDM at the 5% level (no cascade-stream J-inheritance signature, no junction-node J-summation pattern), the M3 cascade-stream explanation is refuted. The signature SCT prediction is vorticity at junction nodes equaling the vector sum of the contributing filament J vectors.