This description is accomplished by the specification of the particular positions of the particles. The latter evolve in accordance with the “guiding equation”, which expresses the velocities of the particles in terms of the wave perform. Thus, in Bohmian mechanics the configuration of a system of particles evolves via a deterministic motion choreographed by the wave perform.
In Bohmian mechanics a system of particles is described partly by its wave perform, evolving, as ordinary, according to Schrödinger’s equation. However, the wave operate offers only a partial description of the system.
Thus Leggett isn’t any instrumentalist, and it is onerous to understand why he so cavalierly dismisses a theory like Bohmian mechanics that clearly doesn’t suffer from the measurement downside, with which he has been so long concerned. Now Bohmian mechanics and commonplace quantum mechanics present clearly different descriptions of what’s occurring on the microscopic quantum degree. So it …