Tachyon Couplings to Fermion

Details Tachyon Couplings to Fermion Tachyon Couplings to Fermion

2008-10-13

arxiv.org/abs/0810.2256v2

JHEP 0812:059,2008

Physics

High Energy Physics

High Energy Physics - Theory

16 pages, latex file; V2:a missing term in the modified tachyon DBI action added

Scientific paper

10.1088/1126-6708/2008/12/059

By fixing the internal CP factor of tachyon and massless Ramond vertex operators in different pictures, we have shown that the internal CP factor of the disk level S-matrix elements of two fermions and odd number of tachyon vertex operators in the world volume of non-BPS D-branes/D-brane-anti-D-brane is zero. We have calculated the S-matrix element of two fermions and two tachyons which has non vanishing internal CP factor, and found the momentum expansion of this amplitude. In the abelian case, we have compared the two-fermion-two-tachyon coupling at low energy with the corresponding coupling in the gauge-fixed supersymmetric tachyon DBI action. The couplings in the two cases are exactly the same.

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