Consistent Value Assignments Can Explain Classicality

TL;DR

This paper proposes that classical behavior emerges from the possibility of consistent value assignments to quantum observables, challenging traditional views that focus on parameters like Planck's constant.

Contribution

It introduces a novel concept of evaluation enabling consistent value assignments to non-comeasurable observables, explaining classicality emergence.

Findings

Existence of evaluations for position and velocity in large rigid bodies

Classicality arises from overcoming non-comeasurability obstacles

Framework allows for consistent classical descriptions in quantum systems

Abstract

The present work proposes an alternative approach to the problem of the emergence of classicality. Typical approaches developed in the literature derive the classical behaviour of a quantum system from conditions that concern the value of the parameters deemed responsible of non-classicality, like Planck constant. Our first step in addressing the problem is instead to identify the physical origin of non-classicality of quantum physics. Nowadays the deepest origin is identified in the impossibility of a simultaneous consistent value assignment to every set of quantum observables. To attack this impossibility a concept of ``evaluation'' is then introduced, which allows for a consistent value assignment to non-comeasurable observables whenever an established set of conditions is satisfied. It is shown that in the case of the motion of the center of mass of a large rigid body evaluations exist that realize a consistent value assignment to both the position and the velocity of the center of mass of the body. In so doing emergence of classicality is explained by overcoming the obstacles to the simultaneous value assignments that allow for a classical description of the phenomenon. This result prompts to search for extensions and generalization of the approach.