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Paper   IPM / Physic / 6901
School of Physics
  Title:   On-Shell S-Matrix and Tachyonic Effective Actions
  Author(s):  M.R. Garousi
  Status:   Published
  Journal: Nucl. Phys. B
  No.:  40
  Vol.:  647
  Year:  2002
  Pages:   117-130
  Supported by:  IPM
We evaluate various disk level four-point functions involving the massless scalar and tachyon vertex operators in the presence of background B-flux in superstring theory. By studying these amplitudes in specific limits, we find couplings of two scalars with two tachyons, and couplings of four tachyons on the world-volume of non-BPS D-branes of superstring theory. They are fully consistent with the non-commutative tachyonic Dirac-Born-Infeld effective action. They also fix the coefficient of T4 term in the expansion of the tachyon potential around its maximum.

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