Pocket Cosmology: A Conceptual Framework for Existence, Stability, and the Quantum-Classical Boundary

A conceptual framework addressing three foundational questions: why something exists rather than nothing, why the universe appears stable and law-governed, and why quantum mechanics and general relativity appear to describe different realities. The framework proposes that ultimate reality has structure but is not bound by deterministic causal relations — events need not follow from prior states — and that our universe is a region of local coherence within this field, where such causal relations hold locally. The proposal is placed in conceptual dialogue with KAM theory (Kolmogorov–Arnold–Moser, 1954), invoked not as a formal model but as an existence proof that the concept of "islands of order within disorder" is mathematically coherent. The central implication is that the tension between quantum mechanics and general relativity may be a boundary phenomenon rather than a unification problem. Constructed without prior academic knowledge of the referenced work; correspondences identified after the fact. Version note: This revision (17 April 2026) substantially restructures the argument of the original draft (14 April 2026). Key changes: (1) the characterization of ultimate reality is reformulated from "containing both logic and chaos" to "not bound by deterministic causal relation," as logic and illogic require each other as contrast and cannot serve as distinct modes; (2) the KAM connection is clarified as conceptual reference rather than formal mapping; (3) the "personal implication" section on pattern identity and recurrence has been removed as structurally separate from the core framework; (4) open problems — quantum phenomena observed throughout macroscopic regimes, the absence of a derivation connecting to the decoherence program, and the distinction between shared location and shared theory with Mnaymneh (arXiv:2508.00044) — are now explicitly flagged rather than elided.