Ambitwistor strings in four dimensions.

@article{Geyer2014AmbitwistorSI,
  title={Ambitwistor strings in four dimensions.},
  author={Yvonne Geyer and Arthur Lipstein and Lionel Mason},
  journal={Physical review letters},
  year={2014},
  volume={113 8},
  pages={
          081602
        }
}
We develop ambitwistor string theories for four dimensions to obtain new formulas for tree-level gauge and gravity amplitudes with arbitrary amounts of supersymmetry. Ambitwistor space is the space of complex null geodesics in complexified Minkowski space, and in contrast to earlier ambitwistor strings, we use twistors rather than vectors to represent this space. Although superficially similar to the original twistor string theories of Witten, Berkovits, and Skinner, these theories differ in… 

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