S8 Tension

The S8 tension — the ~3σ discrepancy between the amplitude of matter clustering predicted from CMB data (S8 ~ 0.834) and the lower value inferred from weak gravitational lensing surveys (S8 ~ 0.776) — arises in ΛCDM because the theory assumes all gravitational influence is traceable to discrete dark matter particles following a single collapse history. Successive Collision Theory replaces this picture with gravitational superposition across nested comoving frames: when two or more gravitationally bound frame hierarchies overlap, their stress-energy tensors superpose constructively in accordance with GR's linearity in weak fields, producing an effective gravitational influence that exceeds what any single frame's matter inventory would predict. This superposition selectively enhances gravitational effects on the intermediate scales (10–100 Mpc) probed by weak lensing surveys, while leaving the photon-baryon acoustic physics at z~1100 unchanged, because the collision-deposited angular momentum and frame overlap were established before decoupling.

Weak lensing surveys measure projected mass along lines of sight that inevitably cross multiple frame boundaries at low redshift, sampling a superposed gravitational field that is genuinely stronger than a single-frame prediction would yield. The CMB, by contrast, encodes the pre-decoupling state when the plasma was still thermalized and the frame superposition had not yet organized into the large-scale structure traced by lensing surveys today. SCT therefore predicts that the matter power spectrum will appear suppressed relative to CMB extrapolations on scales comparable to the inter-frame separation length — not because matter is missing, but because the lensing surveys and the CMB are sampling the same superposed gravitational field at different epochs of its organizational history. The inferred S8 discrepancy is a consequence of applying a single-frame ΛCDM model to a multi-frame superposed reality, and it diminishes naturally once the coherent superposition contribution to the stress-energy tensor is properly included.