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Paper   IPM / Physic / 6954
School of Physics
  Title:   Off-Shell Extension of S-Matrix Elements and Tachyonic Effective Actions
  Author(s):  M.R. Garousi
  Status:   Published
  Journal: JHEP
  No.:  13
  Vol.:  04
  Year:  2003
  Pages:   027
  Supported by:  IPM
  Abstract:
We show that the on-shell S-matrix elements of four open string massless scalars, two scalars and two tachyons, and four open string tachyons in the super string theory can be written in a unique form. We then propose an off-shell extension for the S-matrix element of four scalars which is consistent, in the low energy limit, with the Dirac-Born-Infeld effective action. Using a similar off-shell extension for the S-matrix element of two scalars and two tachyons and for the S-matrix element of four tachyons, we show that they are fully consistent with the tachyonic DBI action.

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