Spectral flow in AdS$\mathbf{_3}$ revisited
We revisit an old idea that spectral flow in WZW models can be associated with certain $G$-bundles over a worldsheet. This allows us to introduce a novel method for computing correlators of spectrally-flowed vertex operators in WZW models with group $G$ and level $k$, by systematically computing the contribution from a network of line defects. Specialising to the case of $G=SL(2, \mathbb{R})$, as is relevant to AdS$_3$ string theory, we demonstrate that generic $n$-point functions of spectrally-flowed vertex operators at tree level can be rewritten in terms of an $(n+1)$-point function of $n$ unflowed vertex operators and one degenerate insertion. This is to be interpreted as an unflowed $n$-point function in an instanton background. Moreover, we conjecture that this $(n+1)$-point function can be recast as an $n$-point function of unflowed operators and we provide evidence for this. We demonstrate that the $(n+1)$-point function satisfies the same constraints from global spacetime conformal invariance as does an unflowed $n$-point function for a specific choice of spacetime coordinates that we determine. We verify that our results agree with bootstrap results in the literature. This provides the next step towards fully solving the $SL(2,\mathbb{R})$ WZW model.