# A Correlation functions in position and momentum space

1. Oct 5, 2016

### spaghetti3451

What is the relation between the correlators $\langle 0 | T\phi(x_{1})\phi(x_{2}) | 0 \rangle$ and $\langle 0 | T\phi(p)\phi(x=0) | 0 \rangle$?

I can derive the momentum space Feynman rules for $\langle 0 | T\phi(x_{1})\phi(x_{2}) | 0 \rangle$. Are the momentum space Feynman rules for $\langle 0 | T\phi(p)\phi(x=0) | 0 \rangle$ the same?

2. Oct 11, 2016

### Greg Bernhardt

Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.