Weak-lensing and cluster-count surveys (KiDS-1000, DES Y3, HSC) measure a kink or suppression in σ₈(z) growth at intermediate redshift z ≈ 0.5 to 1.5, lower than the smooth growth ΛCDM predicts from Planck CMB initial conditions (Macaulay 2013; Abbott 2018). The discrepancy is not just an amplitude offset; the redshift trend itself does not match.
The standard model assumes smooth scale-invariant matter-perturbation growth driven by a constant Λ from CMB-set initial conditions through to today. Under that assumption, the growth rate is the same in every environment and at every redshift. Observations showing a kink in the growth history have nowhere to go in the model.
SCT replaces the hot-dense-center with a superluminal collision and the thermalized debris field. From this single change, Λ becomes the dynamical ratio Λ_eff(x,t) = κ · U_local(x,t) / U_parent(x,t) (P17). The growth rate is therefore environment-dependent: enhanced Λ_eff in our local KBC supervoid suppresses local clustering growth, while regions outside the void experience the unsuppressed cosmic-average growth (P19).
Surveys that span the redshift range from outside our local underdensity (z > 1.5) to inside it (z < 0.5) trace exactly this transition. At high z the line of sight extends beyond the KBC supervoid into more representative cosmic volume, recovering closer to the Planck-extrapolated growth rate. As measurements probe lower z, the path increasingly passes through our locally enhanced Λ_eff field, and clustering growth measures progressively lower σ₈. The kink in the growth history is the geometric signature of crossing into the local-void enhancement (P14, P15, P16, P18).
The same mechanism that resolves the Hubble tension and the S₈ amplitude deficit produces the kink in σ₈(z) growth. There is no need to invoke modified gravity, evolving dark-energy equation of state, or massive neutrinos at Σm_ν > 0.3 eV (which conflict with other constraints). Both the amplitude offset and the kink shape are imprints of the same underlying environmental Λ_eff field.
If high-redshift weak-lensing measurements at z > 2 (Euclid photometric weak lensing, well outside our local KBC void) recover σ₈(z) consistent with the Planck-extrapolated smooth growth at the 1% level, the M5 local-environment explanation is supported. If they instead show the same suppression at z > 2 as at z < 1, the explanation is refuted in favor of a global-physics modification.