Notes on $n$-point Witten diagrams in AdS${}_2$

Abstract

Witten diagrams provide a perturbative framework for calculations in Anti-de-Sitter space, and play an essential role in a variety of holographic computations. In the case of this study in AdS${}_2$, the one-dimensional boundary allows for a simple setup, in which we obtain perturbative analytic results for correlators with the residue theorem. This elementary method is used to find all scalar $n$-point contact Witten diagrams for external operators of conformal dimension $\Delta =1$ and $\Delta =2$, and to determine topological correlators of Yang-Mills in AdS${}_2$. Another established method is applied to explicitly compute exchange diagrams and give an example of a Polyakov block in $d=1$. We also check perturbatively a recently proposed multipoint Ward identity with the strong coupling expansion of the six-point function of operators inserted on the 1/2 BPS Wilson line in $\mathcal{N}$=4 SYM.

39 pages, 10 figures; v${}_2$ has an attached mathematica .nb to evaluate the contact diagrams with arbitrary weights $I_{{\Delta }_1,...,{\Delta }_n}$, some notation changed for clarity

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