On-shell S-matrix and tachyonic effective actions

Details On-shell S-matrix and tachyonic effective actions On-shell S-matrix and tachyonic effective actions

2002-09-08

arxiv.org/abs/hep-th/0209068v3

Nucl.Phys. B647 (2002) 117-130

Physics

High Energy Physics

High Energy Physics - Theory

Latex, 15 pages, no figures, some numbers are corrected

Scientific paper

10.1016/S0550-3213(02)00903-3

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 $T^4$ term in the expansion of the tachyon potential around its maximum.

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