The S-matrix in twistor space

@article{ArkaniHamed2009TheSI,
  title={The S-matrix in twistor space},
  author={Nima Arkani-Hamed and Freddy Cachazo and Clifford Cheung and Jared Kaplan},
  journal={Journal of High Energy Physics},
  year={2009},
  volume={2010},
  pages={1-48}
}
The marvelous simplicity and remarkable hidden symmetries recently uncovered in (Super) Yang-Mills and (Super)Gravity scattering amplitudes strongly suggests the existence of a “weak-weak” dual formulation of these theories where these structures are made more manifest at the expense of manifest locality. In this note we suggest that in four dimensions, this dual description lives in (2, 2) signature and is naturally formulated in twistor space. We begin at tree-level, by recasting the momentum… 
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