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arXiv 1106.2646hep-th
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完整的N点超弦盘振幅II。振幅与超几何函数结构

Complete N-Point Superstring Disk Amplitude II. Amplitude and Hypergeometric Function Structure

Carlos R. Mafra, Oliver Schlotterer, Stephan Stieberger

摘要:

使用第一部分[1]中的纯旋量形式,我们计算了N个无质量开弦的完整树级振幅,并找到了一个惊人的简单紧凑的最小构建块形式:完整的N点振幅表示为(N-3)的和!杨-米尔斯部分子振幅,每个子振幅乘以一个多重高斯超几何函数。前者捕捉振幅的时空运动学,后者编码弦效应。这一结果掩盖了许多结构方面的规范振幅的颜色和运动学与广义欧拉积分的性质。第二部分详细分析了多重超几何函数的结构:给出了多重超几何函数与单值方程的关系,多重超几何函数的最小基结构,多重超几何函数的极点和超越性的确定方法。最后,Groebner基分析提供了欧拉积分中独立的有理函数集。

英文摘要:

Using the pure spinor formalism in part I [1] we compute the complete tree-level amplitude of N massless open strings and find a striking simple and compact form in terms of minimal building blocks: the full N-point amplitude is expressed by a sum over (N-3)! Yang-Mills partial subamplitudes each multiplying a multiple Gaussian hypergeometric function. While the former capture the space-time kinematics of the amplitude the latter encode the string effects. This result disguises a lot of structure linking aspects of gauge amplitudes as color and kinematics with properties of generalized Euler integrals. In this part II the structure of the multiple hypergeometric functions is analyzed in detail: their relations to monodromy equations, their minimal basis structure, and methods to determine their poles and transcendentality properties are proposed. Finally, a Groebner basis analysis provides independent sets of rational functions in the Euler integrals.

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