We present a minimal phenomenological extension of late-time cosmology based on the concept of structural retention. The model introduces a single parameter, ψc, which modifies the growth index and clustering amplitude. Using a simplified likelihood framework and a minimal MCMC analysis applied to representative fσ8 (z) data, we obtain: ψc ≈ 0. 10 ± 0. 02 We further compare the model with the ΛCDM baseline using a χ² criterion and find a statistically meaningful improvement: Δχ² ≈ 5–6 This suggests that late-time structure formation may include a weak retentive component, providing a unified interpretation of growth suppression and clustering tension. This work is intentionally minimal and is intended as a first data-linked formulation of retention cosmology.
logacheva Yulia (Fri,) studied this question.