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arXiv 0901.1163hep-th
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高阶树水平上闭弦振幅与开弦振幅的关系

Relations Between Closed String Amplitudes at Higher-order Tree Level and Open String Amplitudes

Yi-Xin Chen, Yi-Jian Du, Qian Ma

摘要:

KLT关系几乎将$S_2$上的闭弦振幅分解为两个开弦树振幅,这两个开弦树振幅对应于左移动扇区和右移动扇区。本文研究了$D_2$和$RP_2$上的弦振幅。我们发现KLT分解关系在这两种情况下不成立。闭弦振幅与开弦振幅之间的关系有了新的形式。在$D_2$和$RP_2$上,向左和向右移动的扇区连接成一个扇区。然后,$D_2$或$RP_2$上闭弦的振幅可以由一个开弦树振幅给出,除了相位因子。在T-对偶下,$D_2$和$RP_2$上的关系给出了开弦分振幅分别作用于D-膜和O-平面的闭弦散射的振幅,在这两种情况的低能极限下,引力子振幅的因式分解关系不成立.引力子的振幅必须由新的关系式给出。

英文摘要:

KLT relations almost factorize closed string amplitudes on $S_2$ by two open string tree amplitudes which correspond to the left- and the right- moving sectors. In this paper, we investigate string amplitudes on $D_2$ and $RP_2$. We find that KLT factorization relations do not hold in these two cases. The relations between closed and open string amplitudes have new forms. On $D_2$ and $RP_2$, the left- and the right- moving sectors are connected into a single sector. Then an amplitude with closed strings on $D_2$ or $RP_2$ can be given by one open string tree amplitude except for a phase factor. The relations depends on the topologies of the world-sheets.Under T-duality, the relations on $D_2$ and $RP_2$ give the amplitudes between closed strings scattering from D-brane and O-plane respectively by open string partial amplitudes.In the low energy limits of these two cases, the factorization relations for graviton amplitudes do not hold. The amplitudes for gravitons must be given by the new relations instead.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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