ψ-Bell: A Structural Transition Theory for the Late-Time Universe

This work develops the ψ-Bell architecture—a minimal structural extension of late-time cosmology in which the observed scale-independent growth suppression (γ ≈ 0.64) arises from a transition to a retentive regime characterised by a stationary difference field Δψ, a stabilising node Ξ, and an equilibrium curvature ωψ². Variational reduction of the ψ-sector yields an infrared fixed point γ* = 0.639… and a structural boundary near z† ≈ 1.7. The framework is presented respectfully as a complementary structural reading to be evaluated alongside ΛCDM as Euclid DR1 refines the late-time Universe.