On shell S matrix and tachyonic effective actions
Sep, 200215 pages
Published in:
- Nucl.Phys.B 647 (2002) 117-130
e-Print:
- hep-th/0209068 [hep-th]
Report number:
- IPM-P-2002-038
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Abstract:
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 term in the expansion of the tachyon potential around its maximum.- string model
- effective action
- membrane model: D-brane
- tachyon
- operator: vertex
- scattering amplitude
- analytic properties
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