A Resonance–Coherence Interpretation of Cellular Size Regulation Within the Sympathetic Harmonic Resonance Framework (SHRF)

Abstract Cell size regulation is a universal and tightly constrained biological phenomenon, yet existing models—based on nutrient sensing, molecular dilution, or checkpoint timing—remain largely descriptive and system-specific. Here we propose a unifying physical interpretation of cell size control within the Sympathetic Harmonic Resonance Framework (SHRF), in which the cell is treated as a bounded, actively driven resonant system. In this view, cell size is limited not by mass accumulation per se, but by the requirement to maintain global phase coherence across coupled biochemical, mechanical, and electrochemical oscillatory processes. We argue that cell division functions as a coherence-restoring transition triggered when resonance stability degrades beyond a critical threshold. This framework naturally explains size homeostasis, cell-type-specific size ranges, environmental sensitivity, and the robustness of size control across taxa, while yielding experimentally testable predictions that extend beyond conventional biochemical models.