Infogravity 4.5 : Descriptive Dynamics and Regime-Selective Gravity

Infogravity 4.5 completes the dynamical foundation of the Infogravity program by formulating a notion of full descriptive dynamics that is compatible with coarse-graining across scales. Rather than postulating a fundamental microscopic evolution, the theory characterizes admissible dynamics as families of completely positive semigroup generators whose time evolution approximately commutes with scale-dependent coarse-graining maps. This compatibility requirement acts as a strong exclusion principle, sharply restricting which effective dynamics can persist across descriptive layers. Within this framework, gravitational geometry is not treated as a fundamental interaction but emerges as a condition of dynamical stability. An information-theoretic action, built from the rate of information loss under coarse-graining and invariants of Fisher information geometry, selects stable trajectories as attractors in the space of descriptions. Einstein-like and Friedmann-like equations arise as stationarity conditions of this action, rather than as primary dynamical laws. The theory provides explicit criteria for the existence and breakdown of geometric descriptions, predicts regime transitions in cosmology and strong-gravity systems, and clarifies horizons as boundaries between operational regimes. Infogravity 4.5 thus establishes a consistent dynamical closure for emergent geometry, showing that gravity appears only within regimes where descriptive dynamics remain stable under information loss.