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arXiv 1502.06536hep-thgr-qchep-ph
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关于BPS、非BPS和膜-反膜的混合Ramond-Ramond、开弦散射振幅的注记

Remarks on the mixed Ramond -Ramond, open string scattering amplitudes of BPS, non-BPS and brane-anti brane

Ehsan Hatefi

摘要:

本文从世界片的观点出发,计算了IIA型和IIB型超弦理论的三点、四点和五点BPS和非BPS散射振幅。所有这些混合的S-矩阵元素,包括一个封闭的弦Ramond-Ramond(RR)在体和标量/规范或快子与它们的所有不同的图片(包括RR在非对称和对称图片)已被执行。我们还表明,在非对称图像中,各种方程必须保持不变。更重要的是,通过在上半平面上的直接计算,我们认识到某些BPS膜的方程(必须是正确的)不一定适用于非BPS膜的振幅。我们还导出了$<V_C^{-2} V_ϕ^{0}V _A^{0} V_T^{0} >$的S-矩阵元,阐明了在标量场和RR存在的情况下,RR的横向动量项在整个S-矩阵形式中起着重要作用,它们的存在是IIA(IIB)型超弦理论的整个S-矩阵元具有规范不变性所必需的。

英文摘要:

From the world-sheet point of view we compute three, four and five point BPS and non-BPS scattering amplitudes of type IIA and IIB superstring theory. All these the mixed S-matrix elements including a closed string Ramond-Ramond (RR) in the bulk and a scalar/gauge or tachyons with their all different pictures ( including RR in asymmetric and symmetric pictures) have been carried out. We have also shown that in asymmetric pictures various equations must be kept fixed. More importantly, by direct calculations on upper half plane, it is realized that some of the equations (that must be true) for BPS branes can not be necessarily applied to non-BPS amplitudes. We also derive the S-Matrix elements of $<V_C^{-2} V_ϕ^{0}V _A^{0} V_T^{0} >$ and clarify the fact that in the presence of the scalar field and RR, the terms carrying momentum of RR in transverse directions play important role in the entire form of the S-matrix and their presence is needed in order to have gauge invariance for the entire S-matrix elements of type IIA (IIB) superstring theory.

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