New higher-derivative R4 theorems for graviton scattering.

@article{Berkovits2007NewHR,
  title={New higher-derivative R4 theorems for graviton scattering.},
  author={Nathan Berkovits},
  journal={Physical review letters},
  year={2007},
  volume={98 21},
  pages={211601}
}
The nonminimal pure spinor formalism for the superstring is used to prove two new multiloop theorems which are related to recent higher-derivative R4 conjectures of Green, Russo, and Vanhove. The first theorem states that when 0<n<12, partial differential(n)R(4) terms in the Type II effective action do not receive perturbative contributions above n/2 loops. The second theorem states that when n< or =8, perturbative contributions to partial differential(n)R(4) terms in the IIA and IIB effective… CONTINUE READING
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