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Paper   IPM / Physic / 8757
School of Physics
  Title:   On Wess-Zumino Terms of Non-BPS D-Branes and Their Higher Derivative
  Author(s):  M.R. Garousi
  Status:   Preprint
  Year:  2008
  Supported by:  IPM
By calculating various disk level S-matrix elements and studying in details their momentum expansions, we have extracted the Wess-Zumino terms of the non-BPS Dp-branes and their higher derivative corrections. We have found that there is exact consistency between field theory and string theory S-matrix element of one RR and three tachyons provided that one assumes one of the tachyon vertex operators to be along the Pauli matrix σ2 whereas the other two tachyons to be along the σ1 direction. This modifies the tachyon DBI part of the effective action.

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