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- Summary
- Confusion over perturbative series

The link to the paper is here; Quantum sine-Gordon equation as the massive Thirring model

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?