Dynamics of Dirichlet-Neumann Open Strings on D-branes

Details Dynamics of Dirichlet-Neumann Open Strings on D-branes Dynamics of Dirichlet-Neumann Open Strings on D-branes

1996-08-20

arxiv.org/abs/hep-th/9608127v1

Nucl.Phys. B496 (1997) 243-258

Physics

High Energy Physics

High Energy Physics - Theory

LaTeX, 17 pages, 1 eps figure. Uses psfig.sty

Scientific paper

10.1016/S0550-3213(97)00215-0

Method for computing scattering amplitudes of open strings with Dirichlet boundary on one end and Neumann boundary condition on the other is described. Vertex operator for these states are constructed using twist fields which have been studied previously in the context of Ashkin-Teller model and strings on orbifolds. Using these vertex operators, we compute the three- and four-point scattering amplitudes for (5,9) strings on 5-branes and 9-branes. In the low energy limit, these amplitudes are found to be in exact agreement with the field theory amplitudes for supersymmetric Yang-Mills coupled to hypermultiplets in 6-dimensions. We also consider the 1-brane 5-brane system and compute the amplitude for a pair of (1,5) strings to collide and to escape the brane as a closed string. (1,5) strings are found to be remarkably selective in their coupling to massless closed strings in NS-NS sector; they only couple to the dilaton.

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