Recent content by msid

\phi(0) is not a number, it is an operator at a specified location in spacetime, which in this case is at the origin of it. It makes sense that it can only depend on k^2 and k^2 = -M^2, which we are summing over. This is acceptable if the interchange of the summation over 'n' and the integral...

Sorry, I still do not get it. Isn't |<k,n|\phi(0)|0>|^{2} dependent on 'k'? Could you please elaborate?

I already posted this in the homework/course section, but got no reply, so I'm crossposting here(Sorry for this) Problem with the ordering of integrals in the derivation of the Lehmann-Kaller form of the exact propagator in Srednicki's book. We start with the definition of the exact...

Luckily, the author has a free draft version of the textbook on his website. The relevant contents are the same. http://www.physics.ucsb.edu/~mark/qft.html Pg 107-108 Eqns 13.11, 13.12 and the use of 13.15 to get 13.16

Homework Statement Problem with the ordering of integrals in the derivation of the Lehmann-Kaller form of the exact propagator in Srednicki's book. We start with the definition of the exact propagator in terms of the 2-point correlation function and introduce the complete set of momentum...