Cesare Tronci‘s new paper “Madelung hydrodynamics of spin-orbit coupling: action principles, currents, and correlations“, while still a preprint (arXiv:2601.10698) (link here) is already attracting attention. It has been written up in the online journal “Medium” in an article entitled “Open-Sourcing the Universe’s Code: Spin–Orbit Coupling Was Always Geometry” (link here) and written up in the online journal “Quantum Zeitgeist” in an article entitled “Spin-orbit Coupling Advances Quantum Hydrodynamics, Unveiling New Correlation Mechanisms and Currents” (link here). The picture below is from the Medium article.