Time Field Theory XVIII: Quantum Measurement, Phase Locking, and the Dynamical Origin of Wavefunction Collapse

This paper is a direct, complete, and self-contained continuation of the Time Field Theory (TFT) framework established in Parts I, II, and III. Based on the fast–slow oscillation decomposition of the time field γ derived in TFT III, we provide a full dynamical explanation for quantum measurement and the so-called wavefunction collapse without introducing nonlocality, hidden variables, superluminal effects, or ad hoc quantum postulates. We show that quantum measurement is fundamentally phase locking between the high-frequency time oscillation of a macroscopic observer and the low-frequency time oscillation of a microscopic particle. Crucially, this mechanism is identified as a natural extension of special relativity to the temporal structure of matter, based on the principle of relative states. Wavefunction collapse is not a mysterious projection, but a dynamical localization effect caused by the extreme frequency mismatch between massive observer systems and light microscopic systems. The mechanism of entanglement is explained as conserved common phase splitting from a single source. Bell experiments are interpreted locally and causally via phase locking and relative states. This work eliminates the measurement problem, explains the origin of quantum randomness, and completes the causal, realistic, local interpretation of quantum mechanics within the unified TFT framework.