Rationalizing roots: an algorithmic approach

Rationalizing roots: an algorithmic approach
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合理化根:一种算法方法

DOI:
10.4310/cntp.2019.v13.n2.a1
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发表时间:
2018
影响因子:
1.9
通讯作者:
S. Weinzierl
S. Weinzierl
中科院分区:
数学2区
文献类型:
--
作者:
M. Besier;D. Straten;S. Weinzierl

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在计算多重多对数的费曼积分时,经常会遇到平方根。为了用多重多重数来表示费曼积分,人们寻求变量的变换,它使平方根有理。在这篇文章中,我们给出了一个有理化根的算法。该算法适用于与根相关的代数超曲面有重点$(d-1)$时,其中$d$是代数超曲面的次数。我们证明了可以迭代地使用该算法来同时有理化多个根。讨论了高能物理中的几个例子。
In the computation of Feynman integrals which evaluate to multiple polylogarithms one encounters quite often square roots. To express the Feynman integral in terms of multiple polylogarithms, one seeks a transformation of variables, which rationalizes the square roots. In this paper, we give an algorithm for rationalizing roots. The algorithm is applicable whenever the algebraic hypersurface associated with the root has a point of multiplicity $(d-1)$, where $d$ is the degree of the algebraic hypersurface. We show that one can use the algorithm iteratively to rationalize multiple roots simultaneously. Several examples from high energy physics are discussed.
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影响因子: 5.4
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