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On-shell S-matrix and tachyonic effective actions

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arxiv hep-th/0209068 v3 pith:AL2ETOME submitted 2002-09-08 hep-th

classification hep-th
keywords couplingseffectivesuperstringtachyontachyonictachyonstheorythey
verification ladder T0 review T1 audit T2 compute T3 formal
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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 $T^4$ term in the expansion of the tachyon potential around its maximum.

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Cited by 1 Pith paper

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  1. Tachyon couplings from S-matrix elements in bosonic string theory

    hep-th 2026-08 conditional novelty 6.0 of 10

    The paper argues that bosonic string effective actions contain only even numbers of tachyon fields and extracts D-brane tachyon couplings that match type 0 theory.

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