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arXiv 2006.11292hep-th
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Minkowski空间中的对偶共形盒积分

The Dual Conformal Box Integral in Minkowski Space

Luke Corcoran, Matthias Staudacher

摘要:

Minkowski空间中的对偶共形盒积分不完全由共形不变量$z$和$\bar{z}$决定。取决于运动区域,其值是在欧几里得情况下发生的布洛赫-维格纳函数的“分支”上。闵可夫斯基空间中的对偶特殊共形变换可以改变运动学区域,使得积分的值跳到该函数的另一个分支,从而对积分的对偶共形不变性进行微妙的破坏。本文对紧化Minkowski空间中四点的共形等价构形进行了分类。我们表明,从任何配置,可以达到四个分支的积分使用双特殊保形变换。我们还表明,大多数配置与真正的$z$和$\bar{z}$可以共形映射到一个配置在同一运动区域的两个点在无穷远,其中盒积分可以直接计算在Minkowski空间中使用的留数定理。

英文摘要:

The dual conformal box integral in Minkowski space is not fully determined by the conformal invariants $z$ and $\bar{z}$. Depending on the kinematic region its value is on a 'branch' of the Bloch-Wigner function which occurs in the Euclidean case. Dual special conformal transformations in Minkowski space can change the kinematic region in such a way that the value of the integral jumps to another branch of this function, encoding a subtle breaking of dual conformal invariance for the integral. We classify conformally equivalent configurations of four points in compactified Minkowski space. We show that starting with any configuration, one can reach up to four branches of the integral using dual special conformal transformations. We also show that most configurations with real $z$ and $\bar{z}$ can be conformally mapped to a configuration in the same kinematic region with two points at infinity, where the box integral can be calculated directly in Minkowski space using only the residue theorem.

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