New posts in Lagrangian Formalism

Derive canonical commutation relations from Schwingers principle

Action principle, Lagrangian mechanics, Hamiltonian mechanics, and conservation laws when assuming Aristotelian mechanics $F=mv$

In what sense is the proper/effective action $\Gamma[\phi_c]$ a quantum-corrected classical action $S[\phi]$?

How to calculate second-order variations of an action?

What constitutes a symmetry for Noether's Theorem?

Is the shorthand $ \partial_{\mu} $ strictly a partial derivative in field theory?

Variation of Maxwell action with respect to the vierbein - Einstein-Cartan Theory

Is the Lagrangian density a functional or a function?

Why exactly do we say $L = L(q, \dot{q})$ and $H = H(q, p)$?

How can a generic potential transform under Lorentz transformations?