- #1

QFT1995

- 30

- 1

- TL;DR Summary
- Confusion over perturbative series

The link to the paper is here; http://www.sbfisica.org.br/~evjaspc/xviii/images/Nunez/Jan26/AdditionalMaterial/Coleman_paper/Coleman_paper.pdf

Im confused over what exactly he is calculating on page 5 (2092) equation 4.11. Specifically what is

$$\mathcal{T} \langle 0 | \prod_i A_+ (x_i) A_-(y_i) | 0 \rangle. $$

Why aren't the ## A_+ (x_i) ## and ##A_-(y_i)## at the same point and what exactly is the object above?

Im confused over what exactly he is calculating on page 5 (2092) equation 4.11. Specifically what is

$$\mathcal{T} \langle 0 | \prod_i A_+ (x_i) A_-(y_i) | 0 \rangle. $$

Why aren't the ## A_+ (x_i) ## and ##A_-(y_i)## at the same point and what exactly is the object above?