Stacking analyses of multiple voids identified in galaxy surveys produce composite void profiles with systematic CMB temperature cold bias. Stacked voids appear colder than ΛCDM simulations predict from the matter underdensity alone (Granett 2010; Nadathur & Hotchkiss 2015). The cold bias suggests either intrinsic void properties beyond simple matter underdensity, or additional mechanisms beyond gravitational evolution contributing to CMB temperature structure.
The standard model assumes void-CMB cold bias comes from the integrated Sachs-Wolfe effect plus standard line-of-sight matter-distribution effects. The observed cold bias exceeds the ΛCDM ISW prediction, demanding either modified void physics or unaccounted-for additional mechanisms. The model has no place for an enhanced void cooling beyond standard ISW.
SCT replaces the hot-dense-center with a superluminal collision and the thermalized debris field. From this single change, void interiors carry enhanced Λ_eff(x,t) sourced by their underdensity (P14, P15, P16, P17). The enhanced Λ_eff redshifts CMB photons traversing the void line of sight more than ΛCDM expects (mesh dissipation manifests as redshift, not heating). The KBC supervoid (P19) calibrates the local amplitude of the effect.
Predicted cold bias: roughly 10 to 20 microkelvin on supervoid stacking, matching Granett-style observational detections at the calibrated level. The signal is the integrated mesh-dissipation contribution along the void sightline added to the standard ISW signature. Gravitational superposition (P50, P52) modifies the apparent matter underdensity through the Φ_mesh contribution, producing an additional small modulation on the cold-bias signal that depends on the void's environmental embedding.
The same M5 framework that resolves the ISW deficit (recid 65, 67), the y-distortion deficit (recid 26), and the broader σ₈ tension family produces the void cold bias. Each is a different observational projection of the same dynamical-Λ_eff field acting environment-dependently. There is no need to invoke modified void physics or additional cooling mechanisms beyond mesh dissipation.
If precision Simons Observatory + CMB-S4 void-stacking analyses find cold bias consistent with the standard ISW prediction at the 1 microkelvin level (no 10 to 20 microkelvin excess from enhanced Λ_eff), the M5 mesh-dissipation void-cooling explanation is refuted. The signature SCT prediction is the cold-bias amplitude scaling with void underdensity at the cascade-calibrated rate.