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arXiv 1510.01774hep-th
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开弦和闭弦的圆盘散射(I)

Disk Scattering of Open and Closed Strings (I)

Stephan Stieberger, Tomasz R. Taylor

摘要:

在树的层次上,涉及开弦和闭弦的散射过程由一个在边界和块中插入顶点算子的圆盘世界表来描述。这样的振幅可以被分解为纯开弦振幅的某些线性组合。虽然以前的关系已经建立在双重覆盖(复球)在这封信中,我们推导出他们在磁盘(上复半平面)允许不同的动量的左,右运动的封闭字符串。形式上,涉及到开弦和闭弦的圆盘振幅的计算被简化为考虑弦世界片上的单值性。

英文摘要:

At the tree level, the scattering processes involving open and closed strings are described by a disk world-sheet with vertex operator insertions at the boundary and in the bulk. Such amplitudes can be decomposed as certain linear combinations of pure open string amplitudes. While previous relations have been established on the double cover (complex sphere) in this letter we derive them on the disk (upper complex half plane) allowing for different momenta of the left- and right-movers of the closed string. Formally, the computation of disk amplitudes involving both open and closed strings is reduced to considering the monodromies on the underlying string world-sheet.

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