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| Paper IPM / P / 6663 |
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| Abstract: | |
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We derive fully covariant expressions for all two-point scattering
amplitudes involving closed string tachyon and massless strings
from Dirichlet brane in type 0 theories. The
amplitude for two massless D-brane fluctuations
to product closed string tachyon is also evaluated. We then examine in
detail these string scattering amplitudes in order to extract world-volume
couplings of the tachyon with itself and with massless fields on a D-brane.
We find that the tachyon appears as an overall coupling function in the
Born-Infeld action and conjecture form of the function.
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