Theory of Existing: Process Ontology and Harmonic Selection in Gravitational Wave Observations

Standard physics describes what reality contains; this paper addresses how reality maintains structure. We propose a process ontology—a "Theory of Existing"—built on five empirically grounded components: viscous spacetime as medium, temporal processing as engine, harmonic selection around the golden ratio (φ) as filter, geometric crystallization as output, and gravitational wave observations as empirical anchor. Analysis of 68 LIGO/Virgo gravitational wave events reveals statistically significant φ-convergence in frequency ratios (p < 0.001, system average 1.60, φ ≈ 1.618), with measured progression from 10.9% to 8.9% φ-distance during merger evolution—consistent with crystallization toward geometric ground state. Mass-dependent convergence patterns suggest the mechanism interacts with gravitational dynamics in predictable ways. The framework proposes that φ appears not because it is imposed but because it survives: in viscous media with frequency-dependent damping, maximally irrational ratios experience minimal resonant decay. The golden ratio emerges as stability attractor through damping dynamics. This framework preserves general relativity and quantum mechanics while proposing an ontological substrate: reality as active process converting potential into organized structure through harmonic selection. Falsifiable predictions include reproducibility of φ-organization in numerical relativity simulations, enhanced convergence in extended-duration mergers, and pattern persistence in expanded O5 observations. Reality metabolizes potential into structure through harmonic selection.