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Paper   IPM / Physic / 6620
School of Physics
  Title:   Superstring Scattering from D-Branes Bound States
  Author(s):  M.R. Garousi
  Status:   Published
  Journal: JHEP
  No.:  13
  Vol.:  12
  Year:  1998
  Pages:   008
  Supported by:  IPM
We derive fully covariant expressions for disk scattering amplitudes of any two massless closed strings in which mixed Neumann and Dirichlet world-sheet boundary conditions are included. From the two-point amplitudes, we derive the long range background fields and verify that they correspond to Dp-brane bound state. Also, from the scattering amplitudes, we calculate the linear coupling of closed string fields to D-brane world-volume and show that they are consistent with Born-Infeld and Chern-Simons actions in the presence of a background field.

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