The classical Schr\"odinger equation

TL;DR

This paper introduces a nonlinear Schrödinger equation derived from geometric principles that models classical systems with wavefunctions, enabling classical trajectories to be tracked precisely without dispersion, independent of quantum effects.

Contribution

It presents a novel nonlinear Schrödinger equation that exactly models classical dynamics using wavefunctions, bridging classical and quantum formalisms without relying on quantum mechanics.

Findings

Classical phase space points are represented by wavefunction equivalence classes.

The model tracks classical trajectories precisely over long times.

The construction is independent of Planck's constant, emphasizing a classical wavefunction framework.

Abstract

Using a simple geometrical construction based upon the linear action of the Heisenberg--Weyl group we deduce a new nonlinear Schr\"{o}dinger equation that provides an exact dynamic and energetic model of any classical system whatsoever, be it integrable, nonintegrable or chaotic. Within our model classical phase space points are represented by equivalence classes of wavefunctions that have identical position and momentum expectation values. Transport of these equivalence classes without dispersion leads to a system of wavefunction dynamics such that the expectation values track classical trajectories {\em precisely\/} for arbitrarily long times. Interestingly, the value of $\hbar$ proves immaterial for the purpose of constructing this alternative representation of classical point mechanics. The new feature which $\hbar$ does mediate concerns a simple embedding of the quantum geometric phase within classical mechanics. We discuss problems of physical interpretation and discover a simple route to recover the ordinary linear Schr\"{o}dinger equation.