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arXiv 1004.3498hep-thmath-phmath.MP
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AdS_5中多面体弱耦合时的振幅

Amplitudes at Weak Coupling as Polytopes in AdS_5

Lionel Mason, David Skinner

摘要:

我们表明,单圈标量盒函数可以被解释为体积的测地线四面体嵌入在一个副本的AdS_5,具有对偶共形时空作为边界。当四面体是类空时,它位于AdS_5内部的一个全测地双曲三维空间中,其四个顶点在边界上。这是一个经典的结果,这种四面体的体积是由布洛赫-维格纳双对数,这符合标准的物理公式,这种盒函数。在N=4的超级杨-米尔斯中,n粒子单圈MHV振幅中出现的盒函数的组合对应于一个无边界的三维多面体的体积,其所有顶点都连接到无穷远处的一个零多边形(在其他公式中被解释为威尔逊圈)。

英文摘要:

We show that one-loop scalar box functions can be interpreted as volumes of geodesic tetrahedra embedded in a copy of AdS_5 that has dual conformal space-time as boundary. When the tetrahedron is space-like, it lies in a totally geodesic hyperbolic three-space inside AdS_5, with its four vertices on the boundary. It is a classical result that the volume of such a tetrahedron is given by the Bloch-Wigner dilogarithm and this agrees with the standard physics formulae for such box functions. The combinations of box functions that arise in the n-particle one-loop MHV amplitude in N=4 super Yang-Mills correspond to the volume of a three-dimensional polytope without boundary, all of whose vertices are attached to a null polygon (which in other formulations is interpreted as a Wilson loop) at infinity.

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