hi! wald is too much concise in that chapter. its chapter 5, right?
dude, i had studied it ealier, i will be brief and then you ask what is not yet clear later, ok?
yes, the vectors "u" are timelike vectors tangent to the hypersurface. the point here is to grab the definitions given. wald...
Homework Statement
Hello all, thanks for reading...
I was assigned to calculate feynman rules for the scalar QED theory via functional methods.
The fields are a scalar complex field \phi, \phi^* and gauge field A_\mu, and the lagrangean is
\mathfrak{L} = (D_\mu \phi)^* (D^\mu \phi) - m^2...