Structural Differentiation Cosmology: Minimal Dynamical Core

This study introduces a minimal dynamical formulation of Structural Differentiation Cosmology (SDC). Within this framework, observed cosmic expansion is interpreted as an exponential projection of irreversible internal structural differentiation in an externally closed universe. The model is built around a single bounded structural variable, C(t), governed by a saturating logistic-type evolution equation. This paper presents an early formulation of SDC and its minimal dynamical core. Subsequent versions extend the framework toward observational tests and phenomenological applications.