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The Overall Coefficient of the Two-loop Superstring Amplitude Using Pure Spinors

MPS-Authors
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Mafra,  Carlos R.
Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Fulltext (public)

1003.0678
(Preprint), 298KB

JHEP2010_017.pdf
(Any fulltext), 830KB

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Citation

Gomez, H., & Mafra, C. R. (2010). The Overall Coefficient of the Two-loop Superstring Amplitude Using Pure Spinors. Journal of high energy physics: JHEP, 2010(05): 017. doi:10.1007/JHEP05(2010)017.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0012-69D6-1
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.