New posts in Action

Are all Lagrangians translationally invariant?

Why does a square root term make the quantisation of action difficult?

Saddle point approximation and finite action configurations forming a set of zero measure

Is there a deep reason why action comes from a local lagrangian?

Normalization of the action in Special Relativity

Principle of stationary action vs Euler-Lagrange Equation

Why relativistic Lagrangian doesn't simply equal kinetic minus potential energy $L=T-V$?

What is the physical content of the principle of least action?

The dynamical variables in Lagrangian formalism

What does it mean for an action to be invariant under $x \to x'$, $\phi \to \phi'$?