The Coherence–Decoherence Boundary: A Dual Domain Framework for Quantum Foundations

This paper develops a dual-domain framework for quantum foundations grounded in a structural distinction between a nonlocal, atemporal coherence domain (denoted −0) and a local, temporal decoherence domain (denoted +1). Quantum states are interpreted as existing within −0, while classical outcomes emerge when these states transition irreversibly into +1 through decoherence and measurement. The framework is not a modification of quantum mechanics but a reinterpretation of its ontological domain. The framework provides a unified ontological account of: quantum entanglement and nonlocal correlations; the absence of superluminal signalling; the emergence of classicality through decoherence; the mass dependence of decoherence rates; and the persistent incompatibility between quantum field theory and general relativity. Within this model, entanglement corresponds to the persistence of a single −0 state across multiple +1 localisations. Measurement is interpreted not as a collapse occurring within spacetime, but as a boundary transition from coherence to localisation. The paper further argues that gravity should not be interpreted as a quantum field propagating within spacetime, but rather as the geometric structure of the coherence–decoherence boundary itself. This perspective offers a principled explanation for the persistent incompatibility between quantum field theory and general relativity — a tension that may arise not from technical deficiency but from a category error: attempting to describe boundary geometry as though it were content within one of the domains it separates.