Computing the R 4 term at Two Superstring Loops

@inproceedings{Iengo2008ComputingTR,
  title={Computing the R 4 term at Two Superstring Loops},
  author={Roberto Iengo},
  year={2008}
}
We use a previously derived integral representation for the four graviton amplitude at two loops in Super-string theory, whose leading term for vanishing momenta gives the two-loop contribution to the R term in the Effective Action. We find by an explicit computation that this contribution is zero, in agreement with a general argument implying the vanishing of the R term beyond one loop. As it is well known, Super-string perturbation theory at two loops implies computing a sigma-model… CONTINUE READING
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