Twistor Coverings and Feynman Diagrams

Abstract

Recently, a worldsheet dual to free $\mathcal{N}=4$ Super Yang-Mills has been proposed in terms of twistor variables for ${\mathrm{AdS}}_5$, in parallel to that for the ${\mathrm{AdS}}_3$ dual to the free symmetric orbifold CFT. In the latter case, holomorphic covering maps play a central role in determining correlators and are associated to Feynman diagrams. After recasting these maps in terms of the worldsheet twistor variables for ${\mathrm{AdS}}_3$, we generalise to ${\mathrm{AdS}}_5$. We propose stringy incidence relations and appropriate reality conditions for the twistor covering maps. For some special kinematic configurations of correlators, we exhibit an explicit construction of the corresponding covering map. We find that the closed string worldsheet corresponding to this map is related to a gauge theory Feynman diagram by the Strebel construction, as for ${\mathrm{AdS}}_3/{\mathrm{CFT}}_2$. Rather strikingly, the regularised Strebel area of the worldsheet reproduces the Feynman propagator of the free field theory.

arXiv comment37 pages, 8 figures

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Cited by in corpus (3)

• Characterizing 4-string contact interaction using machine learning
• Classical geometry from the tensionless string
• Lecture notes on strings in AdS${}_3$ from the worldsheet and the AdS${}_3$/CFT${}_2$ duality