On RR Couplings and Bulk Singularity Structures of Non-BPS Branes

Abstract

We compute the five point world sheet scattering amplitude of a symmetric closed string Ramond-Ramond , a transverse scalar field, a world volume gauge field and a real tachyon in both world volume and transverse directions of brane in type IIA and IIB superstring theory. We provide the complete analysis of $<C^{-1}{\varphi }^0{A}^0{T}^{-1}>$ S-matrix and show that both $u^{\prime }=u+\frac{1}{4}$ and $t$ channel bulk singularity structures can also be examined by this S-matrix. Various remarks about new restricted Bianchi identities on world volume for the other pictures have also been made.

Comments: 21 pages, no figure, Latex file, v3: clarifications added. Published version in PLB