# A Regarding Coleman's Sine-Gordon Duality

#### QFT1995

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?

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#### Demystifier

2018 Award
It's a time ordered correlation function. Before studying this paper, you should first learn some more basic QFT (if you haven't already).

#### QFT1995

I understand that its a time ordered correlation function but I'm confused on exactly what the specific perturbation series he is calculating physically means.

#### QFT1995

It's a time ordered correlation function. Before studying this paper, you should first learn some more basic QFT (if you haven't already).
Hi, could you help explain the specific series in the paper. I'm on a deadline and I don't have much time.
Thanks

"Regarding Coleman's Sine-Gordon Duality"

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