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Combinatorics in tensor-integral reduction

机译:张量整体减少的组合学

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摘要

We illustrate a rigorous approach to express the totally symmetric isotropic tensors of arbitrary rank in the n-dimensional Euclidean space as a linear combination of products of Kronecker deltas. By making full use of the symmetries, one can greatly reduce the efforts to compute cumbersome angular integrals into straightforward combinatoric counts. This method is generalised into the cases in which such symmetries are present in subspaces. We further demonstrate the mechanism of the tensor-integral reduction that is widely used in various physics problems such as perturbative calculations of the gauge-field theory in which divergent integrals are regularised in d = 4 - 2 epsilon space-time dimensions. The main derivation is given in the ndimensional Euclidean space. The generalisation of the result to the Minkowski space is also discussed in order to provide graduate students and researchers with techniques of tensor-integral reduction for particle physics problems.
机译:我们说明了一种严格的方法,以表达N维欧几里德空间中任意等级的完全对称各向同性的张量,作为克朗克替代的产品的线性组合。 通过充分利用对称性,可以大大减少计算繁琐的角度整体成直接的组合计数的努力。 该方法是广泛化的,其中这些对称性存在于子空间中。 我们进一步展示了广泛应用于各种物理问题的张量整体减少的机制,例如诸如在D = 4-2 epsilon空间时间尺寸中规则化的测量场理论的扰动计算的扰动计算。 主要推导在Ndimensional欧几里德空间中给出。 还讨论了Minkowski空间结果的概括,以便为研究生和研究人员提供粒子物理问题的张量减少技术。

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