Gauge problem - Lagrangian for a massless particle in FRW
57097
Massless particle in FRW metric
120474
Does the lagrangian contain all the information about the representations of the fields in QFT?
12924
How to derive Maxwell's equations from the electromagnetic Lagrangian?
467
Matter-antimatter asymmetry problem
125565
Counting the number of propagating degrees of freedom in Lorenz Gauge Electrodynamics
145683
What, in simplest terms, is gauge invariance?
128937
Lie theory and particle physics
112723
The problem of self-force on point charges
131822
Polarization vectors of massive and massless particles
137152
Free particle Schrodinger equation: propagator
10785
Form of the Classical EM Lagrangian
138908
Most general Lagrangian in CFT in 0+1D
120590
Determining the Lorenz gauge condition
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?
89479
Galilean invariance of a subset of Maxwell equations
7824
Particles reaching a singularity
40355
Equivalence between Hamiltonian and Lagrangian Mechanics