  To resolve the quantum measurement problem, we propose an objective collapse
theory in which both the wavefunction and the process of collapse are regarded
as ontologically objective. The theory, which we call the
entangling-speed-threshold theory, postulates that collapse occurs when the
entangling speed of a system reaches a threshold, and the collapse basis is
determined so as to eliminate the entangling speed and to minimize its
increasing rate. Using this theory, we provide answers to the questions of
where and when collapse occurs, how the collapse basis is determined, what
systems are (in other words, what the actual tensor product structure is), and
what determines the observables. We also explain how deterministic classical
dynamics emerges from indeterministic quantum collapse, explaining the
quantum-to-classical transition. In addition, we show that the theory
guarantees energy conservation to a high accuracy. We apply the theory to a
macroscopic flying body such as a bullet in the air, and derive a satisfactory
collapse basis that is highly localized in both position and momentum,
consistent with our everyday observation. Finally, we suggest an experiment
that can verify the theory.
