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The principle of least action seems to be one of the most fundamental of high-energy/fundamental interactions physics. But is there some other possibility ton construct a theory of interactions?

Or, is there some theories that explains the least action principle by some other, more fundamental, principle?

xpsf
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1 Answers1

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The classical principle of least action can be explained through the Feynman path integral formulation of quantum mechanics. In that context, it can be understood as the system propagating along all possible paths, with destructive interference cancelling out all paths other than the one fulfilling the principle of least action.

For further reading I recommend "Quantum Field Theory of the Gifted Amateur" by Lancaster and Blundell, pages 16-17 and chapter 23, but surely there are good online resources out there as well.

Codename 47
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