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| Paper IPM / P / 6620 |
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| Abstract: | |
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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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