Why is there a minus in the Gauge Field Lagrangian kinetic term?
129289
What is the origin of the factor of $-1/4$ in the Maxwell Lagrangian?
153727
Constant term in Lagrangian
46053
How to find Hamiltonian from this simple Lagrangian? (tricky)
51122
Lagrangian of Schrodinger field
158099
Why and how does negative velocity exist?
145683
What, in simplest terms, is gauge invariance?
69854
Why is there a minus sign in this wave equation derivation?
55316
Why is the Yang-Mills gauge group assumed compact and semi-simple?
30992
How do you determine the Lagrangian?
49300
How does non-Abelian gauge symmetry imply the quantization of the corresponding charges?
114672
Why do we use the Lagrangian and Hamiltonian instead of other related functions?
85291
Why can velocity and acceleration be negative?
60289
How does QFT interpret the Negative probability problem of the real scalar fields' Klein-Gordon equation?
95836
Why is the electric field is the negative gradient of potential energy function?
131016
Question about Klein-Gordon field Lagrangian
112073
What does a Lagrangian of the form $L=m^2\dot x^4 +U(x)\dot x^2 -W(x)$ represent?
44239
Why the extra term $\frac{1}{2}(\partial_{\rho}A^{\rho})^2$ in the photon Lagrangian?