paper

S-duality of S-matrix

arXiv:1106.1714 · doi:10.1007/JHEP11(2011)016

Abstract

Recently, it has been observed that the kinematic factor of the disk-level S-matrix element of two RR two-forms and the disk-level S-matrix element of two B-fields on the world volume of D-brane are compatible with the standard rules of S-duality. Inspired by this observation, we speculate that the S-matrix elements on the world volume of D-brane are invariant under the transformation. Compatibility with S-duality requires the S-matrix elements on the world volume of D-brane and D-brane to be extended to the -covariant form. In particular, this implies the S-matrix elements on the world volume of F-string and NS-brane at strong coupling to be related by S-duality to the disk-level S-matrix elements of D-string and D-brane, respectively. %The S-matrix elements then dictate that both F-string and NS-brane have D-string excitations. The contact terms of these S-matrix elements at order produce a Born-Infeld and Chern-Simons type effective action for both F-string and NS-brane. They are consistent with the -covariant action appears in the literature.

20 pages, Latex file, no figure; v5: the version appears in JHEP

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