Lorentz transformation in Coulomb gauge

[GreenGiant]

Hello I have been having trouble understanding equation 14.25 in Bjorken and Drell "Relativistic Quantum Fields" and how exactly it gets to it. Also I would like to explicitly find/derive what the operator gauge function is. Can anyone help please?

 

[Max Renn]

Hi,

I know it's a year late, but here's a derivation. I think there's a sign error in there somewhere, though. Let me know if you find it.

 

[Max Renn]

Well, you will be delighted to hear that I think I fixed the sign error.