Minimal Models of Geometric Admissibility Transitions (IM-F006, v0.3)

This document is part of the Informational Mechanics (IM) framework and is published in the IM-F (Geometry & Regime Models) series within the IM v0.3 corpus. The paper provides a minimal, non-dynamical modeling counterpart to the regime-based reinterpretation of early-universe cosmology developed in IM-F005. Rather than proposing a new inflationary mechanism, alternative gravitational dynamics, or microscopic early-universe physics, it constructs a schematic model that represents the onset of geometric admissibility itself. The model introduces a single bookkeeping parameter that tracks when geometric concepts such as distance, curvature, and causal structure become operationally meaningful. This parameter does not correspond to physical time, an energy scale, or a dynamical field, and no equations of motion are postulated. Its purpose is demonstrative: to show that a transition into geometric comparability can be represented consistently without invoking singular initial states, superluminal propagation, or fine-tuned initial conditions. Within this framework, inflationary behavior is reinterpreted as an internal appearance arising from a rapid transition in admissibility rather than as a fundamental dynamical phase. Established cosmological descriptions, including General Relativity and ΛCDM, are recovered unchanged as effective regimes once geometric admissibility is complete. The paper introduces no new axioms, numerical estimates, or observational fits. Its role is demonstrative and structural: to clarify the boundary between interpretive regime analysis and downstream physical modeling within the Informational Mechanics program. Operational discriminators and falsifiability pathways are inherited from IM-F005 (Section VII).