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Paper   IPM / P / 8758
School of Physics
  Title:   On Higher Derivative Corrections of Tachyon Action
  Author(s): 
1.  M.R. Garousi
2.  H. Golchin
  Status:   Preprint
  Journal:
  Year:  2008
  Supported by:  IPM
  Abstract:
We have examined the momentum expansion of the disk level S-matrix element of two tachyons and two gauge fields to find, up to on-shell ambiguity, the couplings of these fields in the world volume theory of N coincident non-BPS D-branes to all order of α′. Using the proposal that the action of D-brane-anti-D-brane is given by the projection of the action of two non-BPS D-branes with (−1)FL, we find the corresponding couplings in the world volume theory of the brane-anti-brane system. Using these infinite tower of couplings, we then calculate the massless pole of the scattering amplitude of one RR field, two tachyons and one gauge field in the brane-anti-brane theory. We find that the massless pole of the field theory amplitude is exactly equal to the massless pole of the disk level S-matrix element of one RR, two tachyons and one gauge field to all order of α′.


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