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The Causality Problem Physics Never Defined

Causality is assumed everywhere in physics. Every prediction depends on it. Every experiment relies on it. Yet fundamental physics never formally defines what causality physically is. In classical gravity, planetary motion is determined by precise mathematical relationships between mass and distance. In quantum mechanics, entangled particles display correlations that defy local hidden-variable explanations. In both cases, physics predicts outcomes with extraordinary accuracy. But prediction is not definition. This investigation examines what the formal structures of gravitational theory and quantum entanglement actually contain — and what they do not. Where, inside the equations of motion, the state vectors, and the probability rules, is causation itself specified? Physics provides evolution laws, constraints, and correlations. It does not introduce a primitive called “cause.” Part of the ongoing series: Physics Cannot Define These — longform investigations into foundational concepts physics relies on but leaves ontologically undefined. Topics explored in this video: • Causality in physics • Newtonian gravity and orbital motion • General relativity and curvature • Quantum entanglement • Bell’s theorem • Hidden-variable models • State evolution and probability rules Physics can calculate how events relate with extraordinary precision. But it cannot say what physically makes one event produce another.