Can a four-divergence be added pure Yang-Mills Lagrangian to alter the action?
72721
Do an action and its Euler-Lagrange equations have the same symmetries?
88658
Confusion regarding the principle of least action in Landau & Lifshitz "The Classical Theory of Fields"
26125
Does the canonical commutation relation fix the form of the momentum operator?
51122
Lagrangian of Schrodinger field
28946
Derivation of Spin Lagrangian
11181
Counting degrees of freedom of gauge bosons
155043
Substitution $\partial_\mu \to D_\mu \equiv \partial_\mu + ieA_\mu$ allows the introduction of electromagnetic interactions
10953
Elementary argument for conservation laws from symmetries *without* using the Lagrangian formalism
61603
Why is the Yang–Mills existence and mass gap problem so fundamental?
79094
Perturbation expansion with path integrals
49300
How does non-Abelian gauge symmetry imply the quantization of the corresponding charges?
112187
Is there a way to see that $ \nabla_\mu g_{\nu \rho} = 0 $ without explicit computation, where $\nabla_\mu$ refers to the covariant derivative?
11358
Eigenvalues of the Lagrangian?
105572
Independent Variables of a Lagrangian
111611
When can we add a total time derivative of $f(q, \dot{q}, t)$ to a Lagrangian?
94173
Deriving the Lagrangian for a free particle
44953
Gauge symmetries and elementary particles