Recent content by StenEdeback

Thank you atyy!

Thank you Demystifier!

Thank you malawi_glenn!

Thank you vanhees71!

Thank you anuttarasammyak!

Hi, I am trying to learn relativistic classical field theory as a preparation for studying quantum field theory. I am currently reading chapter 13 i Herbert Goldstein's Classical Mechanics edition 3, but I think that this book is a bit too brief and does not fully derive and explain the...

Thank you vanhees71! Your answer has shed some light in my foggy mind. It is so good to have the possibility to put questions to Physics Forums. I think that most of my bewilderedness will now fade away for the moment. Thanks again!

I do private studies on my own for fun and right now I read about relativistic field theory as a preparation for later studies of quantum field theory. I simply do not understand where equation 13.78 in Goldstein's "Classical Mechanics" third edition comes from. Please explain. Please also...

Thank you! I thought so too, though I was a little bewildered by the typo. I will need to do the contraction to see the result. I have tried to do so in my head but not succeeded, probably because I was not sure what "inserting a vector into the slot of a tensor" really meant. Now I can proceed...

Thank you!

I have attempted but with no result.

Thank you malawi_glenn for your kind words! I wish you luck in your future studies! Sten edebäck

Hi Orodruin! I think the name of the professor who gave the course in relativity was Ramsgaard. This was in the sixties (I am old, 78). I did most of the studies on my own, with tensor calculus and general relativity, and then I worked as assistant teacher of Mechanics and computer programming...

Thank you vanhees71 for your very interesting comment! I hope to get to these things eventually, though obviously it will take some time. I have studied some group theory but not used it much so far in connection with physics. I have read David J Griffiths' three excellent books about quantum...

Thank you for your long and interesting answer! I will look at both Zee's book and Peskin and Schroeder's book after reading the more basic book about classical fields by Susskind and Friedman. I have finally understood that finding the Lagrangian is a trial and test business. Yes, I enjoy my...