De Broglie’s Dual‑Structure Action Principle and the Theory of Entropicity (ToE): From Hidden Thermodynamics to the Entropic Field — From De Broglie’s Profound Thermodynamic Insight to Obidi’s Entropic Architecture of ToE

De Broglie’s Hidden Thermodynamics and the Entropic Field: How a Forgotten Insight Anticipates the Theory of Entropicity (ToE) Louis de Broglie is remembered in every physics textbook for one idea: wave–particle duality. Yet the most profound insight of his career came decades later, when he attempted something far more ambitious — a unification of mechanics, thermodynamics, and quantum theory under a single principle. In his late work, de Broglie argued that the motion of a particle is not simply a geometric path in spacetime nor a probabilistic wave evolution. Instead, he believed it was the visible expression of a deeper thermodynamic process, which he called hidden thermodynamics.