Artículos de revistas
Multiloop amplitudes and vanishing theorems using the pure spinor formalism for the superstring
Fecha
2004-09-01Registro en:
Journal of High Energy Physics, v. 8, n. 9, p. 1171-1210, 2004.
1029-8479
1126-6708
10.1088/1126-6708/2004/09/047
WOS:000225279400024
2-s2.0-21444436975
Autor
Universidade Estadual Paulista (Unesp)
Institución
Resumen
A ten-dimensional super-Poincaré covariant formalism for the superstring was recently developed which involves a BRST operator constructed from superspace matter variables and a pure spinor ghost variable. A super-Poincaré covariant prescription was defined for computing tree amplitudes and was shown to coincide with the standard RNS prescription. In this paper, picture-changing operators are used to define functional integration over the pure spinor ghosts and and to construct a suitable b ghost. A super-Poincaré covariant prescription is then given for the computation of N-point multiloop amplitudes. One can easily prove that massless N-point multiloop amplitudes vanish for N < 4, confirming the perturbative finiteness of superstring theory. One can also prove the Type IIB S-duality conjecture that R4 terms in the effective action receive no perturbative contributions above one loop. © SISSA/ISAS 2004.