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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Two-loop superstring five-point amplitude and S-duality

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Autor(es):
Gomez, Humberto [1, 2, 3] ; Mafra, Carlos R. [4] ; Schlotterer, Oliver [5]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5 - Canada
[2] UNESP Univ Estadual Paulista, Inst Fis Teor, Caixa Postal 70532-2, BR-01156970 Sao Paulo - Brazil
[3] Univ Santiago Cali, Calle 5 62-00 Barrio Pampalinda, Cali - Colombia
[4] Univ Cambridge, DAMTP, Wilberforce Rd, Cambridge CB3 0WA - England
[5] Max Planck Inst Gravitat Phys, Albert Einstein Inst, D-14476 Potsdam - Germany
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: Physical Review D; v. 93, n. 4 FEB 24 2016.
Citações Web of Science: 8
Resumo

The low-energy limit of the massless two-loop five-point amplitudes for both type IIA and type IIB superstrings is computed with the pure spinor formalism and its overall coefficient determined from first principles. For the type IIB theory, the five-graviton amplitude is found to be proportional to its tree-level counterpart at the corresponding order in alpha'. Their ratio ties in with expectations based on S-duality since it matches the same modular function E-5/2 which relates the two-loop and tree-level four-graviton amplitudes. For R-symmetry violating states, the ratio between tree-level and two-loop amplitudes at the same alpha'-order carries an additional factor of -3/5. Its S-duality origin can be traced back to a modular form derived from E-5/2. (AU)

Processo FAPESP: 13/11409-7 - Twistors, Yang-Mills e teoria de supercordas
Beneficiário:Humberto Gomez Zuñiga
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado