X-ray and SZ observations show cluster pressure profiles are not perfectly self-similar, with the universal profile overpredicting thermal pressure in the outskirts. Non-thermal pressure (turbulence, bulk flows) increases with radius, reaching 20-40% at the virial boundary (Planck 2013; Eckert 2019). Reproducing the radial scaling + magnitude of the turbulent component in ΛCDM simulations requires fine-tuning viscosity or accretion physics.
The standard model has self-similar pressure profiles from gravity-only cluster assembly. Recovering observed non-self-similar deviations + the high outskirts non-thermal fraction demands fine-tuned viscosity, accretion physics, or non-thermal-pressure modeling. The model has no clean source.
SCT replaces the hot-dense-center with a superluminal collision and the thermalized debris field. From this single change, cluster pressure turbulence profiles come from cascade-relic + collision-shock turbulence + gravitational superposition signatures. The cascade collision energy regime (P22, P23) deposits relativistic plasma + turbulence at relic levels in cluster-progenitor matter (cross-link recid 201 non-thermal pressure fractions; recid 126 entropy floor: same cascade-relic origin).
The Plasma Equivalence Theorem (P29, P30) preserves the cascade-deposited turbulence + relativistic-plasma populations adiabatically through cluster assembly. Cluster mergers in SCT operate on already-non-thermal-pressurized plasma populations, producing the observed radial scaling + outskirts non-thermal fraction without requiring fine-tuned viscosity. The cascade contribution dominates at outer radii (where thermal pressure is lowest), naturally producing the observed non-self-similar profiles.
Gravitational superposition (P50, P51, P52) gives apparent cluster pressure dynamics that ΛCDM partly attributes to non-thermal sources but partly to the Φ_mesh contribution that ΛCDM omits. Mesh dissipation at cluster scale (P14, P15, P16) provides ongoing energy injection maintaining the non-thermal pressure across Gyr timescales. The same M2 framework that resolves the y-distortion deficit (recid 26), polarization-bump anomaly (recid 39), ICM entropy floor (recid 126), and non-thermal pressure fractions (recid 201) accounts for pressure turbulence profiles.
If precision Athena + Lynx + future X-ray/SZ surveys find cluster pressure profiles fully consistent with self-similar ΛCDM predictions plus standard non-thermal modeling at the 5% level (no cascade-relic + mesh-contribution signature), the M2 explanation is refuted. The signature SCT prediction is profile shape matching cascade-deposited turbulence + cosmic-web mesh contribution.