Galaxy cluster observations show spatial offsets between X-ray gas peaks and gravitational lensing mass peaks in merging systems, with lensing peaks leading the gas in the direction of motion (Massey 2015; Harvey 2015). ΛCDM interprets these as evidence for collisionless dark matter passing through unimpeded while gas experiences ram pressure. The model faces challenges with offset-magnitude diversity, occasional absent offsets, and complex multi-peak patterns that don't simply align with the collisionless-collisional dichotomy.
The standard model treats gas-DM offsets as direct evidence for collisionless dark matter particles separating from gas during merger dynamics. Recovering the full diversity of observed offset patterns (some clusters show no offset, others show multiple peaks, asymmetric distributions) demands fine-tuned merger geometries or DM particle modifications.
SCT replaces the hot-dense-center with a superluminal collision and the thermalized debris field. From this single change, gas-DM offsets are reinterpreted: there is no DM particle in SCT (P50, P51, P52, P54). The apparent dark-matter mass distribution traced by lensing comes from gravitational superposition through the Φ_mesh contribution from baryonic + cosmic-web mesh structure, not from a collisionless particle population.
The observed gas-lensing offsets reflect merger dynamics where gas (subject to ram pressure + hydrodynamic forces) evolves differently from the inherited Φ_mesh contribution that lensing traces. The pre-merger cluster baryonic mass distribution + its associated Φ_mesh contribution is preserved through the merger more coherently than the gas because the Φ_mesh contribution is sourced by the broader cosmic-web context that the merger does not disturb. Per recid 212 Bullet Cluster: SCT preliminary estimate gives 390 kpc offset vs observed 720 kpc, with full SCT merger simulation pending to resolve the factor of 1.8 discrepancy (Paper 13 Section 6.5(g) open task).
Multi-peak patterns + asymmetric offsets reflect the cosmic-web cascade-stream geometry of the pre-merger cluster + its companion(s): different Φ_mesh components from different cascade-stream-deposited substructures evolve differently through the merger. The same M6 framework that produces the cluster-substructure GGSL excess (recid 194), the c-M relation scatter (recid 195), and the broader no-DM-particle phenomenology accounts for gas-DM offsets as cascade + merger-dynamics signatures rather than DM-particle existence proofs.
If full SCT merger simulation (Paper 13 open task Section 6.5(g)) demonstrably fails to reproduce Bullet-Cluster + similar gas-lensing offset patterns at the 10% level (predicted offset more than 30% different from observed), the M6 no-DM-particle merger-dynamics explanation is refuted. The signature SCT prediction is the offset distribution emerging from baryonic + Φ_mesh dynamics rather than from collisionless-DM particle physics.