# Is there some alternatives to least action principle

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?

• The connection hinges on the fact that classical mechanics is quantum mechanics, when the latter is considered in the limit of macroscopic objects (often formulated as $\hbar \to 0$). In that sense, everything which holds for a quantum mechanical object also holds for a classic object, but obviously not the other way around, since quantum mechanics is the more fundamental theory. – Codename 47 Nov 27 '20 at 17:46