Quantum 2025 – scientific programme

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TUE: Tuesday Contributed Sessions

TUE 10: Foundational / Mathematical Aspects – Rigorous Results

TUE 10.1: Talk

Tuesday, September 9, 2025, 14:15–14:30, ZHG103

Classicality enforced by consistent value assignments — •Giuseppe Antonio Nisticò — University of Calabria, Rende, Italy

The problem of the "emergence of classicality", in rough synthesis, consists in explaining why "macroscopic" systems behave obeying classical laws rather than quantum laws. The present work pursues an approach to this problem alternative to the typical approaches in the literature. The basic step is to identify the deepest origin of non-classicality in the empirically ascertained impossibility of a simultaneous value assignment to all quantum observables. Specific macrosopicity conditions are introduced, which characterize the physical system as rigid homogeneous body. These conditions enforce the possibility of extending the value assignment provided by actually performed measurements to both the position and the velocity of the center of mass of the body, without loosing empirical and quantum theoretical consistency. This made possible by the use of the quantum concept of "evaluation" developed in [Int.J.Theor.Phys., 55 1798 (2016)]. Under regularity conditions for the interaction, it is proved that a center of mass trajectory can be consistently assigned by quantum theory, which satisfies the classical laws of motion.

Keywords: Emergence of classicality in quantum physics; simultaneous values assignment; Quantum trajectory of the center of mass