The Strangest Implication of Quantum Mechanics

Summary by Krater

This video explains the principle of least action in quantum mechanics, detailing how paths interfere and why particles follow the path of least action.

From the video

Answers: Why do objects take the path of least action?

• quantum mechanics
• principle of least action
• double slit experiment
• path integrals
• blackbody radiation
• ultraviolet catastrophe

What it concludes

• Light and matter particles explore all possible paths through space, but only the paths that interfere constructively survive as the actual path.
• The action of ordinary objects spins around zillions of times, cancelling out all paths except the path of least action where phases align constructively.
• Quantum mechanics generalizes classical mechanics by summing amplitudes over all possible paths, weighted by their action divided by Planck's constant.