\pi_r is the momentum density conjugate to the corresponding field in question. Nothing wrong there in my opinion and I show that as follows for the spinpart of the Dirac spinor equations:
We have the complex Dirac field and therefore we are able to use the Dirac field and its adjoint as two...
I see that you post a lot of information but it is not at all towards my questions from the beginning. It was difficult to write down my the questions I had on a paper, that is why I prefer discussions in real life. I wanted to delete or remove my first post but the edit was closed after a...
I need some suggestions and/or corrections if I understand this correct? My questions are based on the book by Mandl and Shaw.
Conserved currents are based on Noethers theorem and directly connected to spacetime and field transformations (rotations, translations, phase, ...). One can...