Pointer states spread and evolve in a continuous, predictable manner. Out of the many possible quantum states are selected those that accord with a stable pointer state. It is a structured and evolutionary process of selection. Through decoherence quantum becomes stable and macroscopic. Similarly, the recent and related but different theory of quantum evolution developed by Wojciech Zurek ( 2009) and others revolves around the idea that decoherence is a real process. The motion of particles produces the overall material structures and processes we happen to recognize in the world we live in. The quantum potential depends only on the form, and not on the intensity of the quantum field. This theory holds that the wave-like characteristics of quantum phenomena stem from a real field of quantum potential. In particular, the de Broglie–Bohm theory (see Bohm & Hiley, 2005) involves determinate sub-quantum-scale processes and a three-dimensional world populated by particles which move according to a non-Newtonian law of motion. As time disappears from the fundamental equations, it does not exist. At that level, time melts into the quantum foam of spacetime. Some like Carlo Rovelli ( 2016) argue that the flow of time is a useful metaphor at the macroscopic level of reality, but fundamentally, the world is made entirely of quantum fields.
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