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The closed-string 3-loop amplitude and S-duality

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Autor(es):
Gomez, Humberto ; Mafra, Carlos R.
Número total de Autores: 2
Tipo de documento: Artigo Científico
Fonte: Journal of High Energy Physics; v. N/A, n. 10, p. 26-pg., 2013-10-30.
Resumo

The low energy limit of the closed-string 3-loop amplitude (including its overall coefficient) is computed for four external massless states using the pure spinor formalism and the result is compared with a prediction of Green and Vanhove based on SL(2, Z) duality. Agreement is found provided the three-loop amplitude prescription includes a symmetry factor 1/3. We argue for its inclusion in order to compensate a Z(3) symmetry present in genus-three Riemann surfaces. (AU)

Processo FAPESP: 07/54623-8 - Aspectos matematicos de spinores puros.
Beneficiário:Humberto Gomez Zuñiga
Modalidade de apoio: Bolsas no Brasil - Doutorado
Processo FAPESP: 13/11409-7 - Twistors, Yang-Mills e teoria de supercordas
Beneficiário:Humberto Gomez Zuñiga
Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado