The Overall Coefficient of the Two-loop Superstring Amplitude Using Pure Spinors
High Energy Physics - Theory
2015-05-18 v2
Abstract
Using the results recently obtained for computing integrals over (non-minimal) pure spinor superspace, we compute the coefficient of the massless two-loop four-point amplitude from first principles. Contrasting with the mathematical difficulties in the RNS formalism where unknown normalizations of chiral determinant formulae force the two-loop coefficient to be determined only indirectly through factorization, the computation in the pure spinor formalism can be smoothly carried out.
Cite
@article{arxiv.1003.0678,
title = {The Overall Coefficient of the Two-loop Superstring Amplitude Using Pure Spinors},
author = {Humberto Gomez and Carlos R. Mafra},
journal= {arXiv preprint arXiv:1003.0678},
year = {2015}
}
Comments
29 pages, harvmac TeX. v2: add references