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arXiv hep-th/0209068hep-th
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壳层S矩阵与快子有效作用量

On-shell S-matrix and tachyonic effective actions

Mohammad R. Garousi

摘要:

在超弦理论背景B通量存在的情况下,我们计算了各种包含无质量标量和快子顶点算符的盘级四点函数。通过研究这些振幅在特定的限制,我们发现耦合的两个标量与两个快子,和耦合的四个快子的世界体积的非BPS超弦理论的D膜。它们与非对易的快子Dirac-Born-Infeld有效作用量完全一致。它们还固定了快子势在其最大值附近展开时的$T^4$项的系数。

英文摘要:

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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