Ambitwistor strings and the scattering equations

@article{Mason2014AmbitwistorSA,
  title={Ambitwistor strings and the scattering equations},
  author={Lionel Mason and David Skinner},
  journal={Journal of High Energy Physics},
  year={2014},
  volume={2014}
}
We show that string theories admit chiral infinite tension analogues in which only the massless parts of the spectrum survive. Geometrically they describe holomorphic maps to spaces of complex null geodesics, known as ambitwistor spaces. They have the standard critical space-time dimensions of string theory (26 in the bosonic case and 10 for the superstring). Quantization leads to the formulae for tree-level scattering amplitudes of massless particles found recently by Cachazo, He and Yuan… 

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