Cluster simulations and X-ray/SZ observations indicate non-thermal pressure (turbulence, cosmic rays, magnetic fields) contributes 20 to 40% of total support, even in seemingly relaxed clusters (Nelson 2014; Shi & Komatsu 2014). The hydrostatic-mass bias from non-thermal pressure systematically affects cluster mass estimates. Persistent high non-thermal support challenges ΛCDM thermalization timescales.
The standard model has clusters approaching hydrostatic equilibrium with thermal pressure dominating. Recovering observed 20-40% non-thermal pressure in relaxed clusters demands either ongoing dynamical processes or unmodeled heating mechanisms beyond standard hierarchical accretion. The model has no clean source for the persistent support.
SCT replaces the hot-dense-center with a superluminal collision and the thermalized debris field. From this single change, cluster non-thermal pressure is the cascade-relic + collision-shock turbulence signature, conserved adiabatically through cluster assembly. The cascade collision energy regime (P22, P23) deposits relativistic plasma + turbulence at relic levels in the cluster-progenitor matter (cross-link to 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-scale assembly. Cluster mergers in SCT operate on already-non-thermal-pressurized plasma populations inherited from cascade-stage events, producing the observed 20-40% non-thermal fraction without requiring constant late-time heating mechanisms. Mesh dissipation at cluster scale (P14, P15, P16) provides additional ongoing energy injection that maintains the non-thermal pressure across Gyr timescales.
Gravitational superposition (P50, P51, P52) gives apparent cluster pressure dynamics that ΛCDM attributes partly to non-thermal sources but partly to the Φ_mesh contribution that ΛCDM omits. The same M2 framework that resolves the y-distortion deficit (recid 26), the polarization-bump anomaly (recid 39), the ICM entropy floor (recid 126), and the broader cascade-thermodynamic cluster signatures accounts for non-thermal pressure as a relic-plus-mesh signature.
If precision Athena + Lynx + future X-ray/SZ surveys find non-thermal pressure fraction in clusters consistent with standard hierarchical-accretion equilibrium predictions at the 5% level (no cascade-relic + mesh-contribution signature), the M2 explanation is refuted. The signature SCT prediction is the non-thermal pressure scaling with cascade-deposited plasma inventory + cosmic-web mesh contribution.