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arXiv 2203.11554hep-th
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UV发散和张量约化

UV Divergence and Tensor Reduction

Qingjun Jin

摘要:

提出了一种有效的算法,将费曼积分的紫外发散分解为局部发散和各种类型的子发散。在适当的假设下,在维正则化格式下,可以唯一地定义Feynman积分的局部发散。通过在硬动量中的渐近展开,将局部和次发散的计算归结为无质量真空积分的局部发散的计算。在自旋$\le\frac{1}{2}$理论中,β函数和反常维数可以直接从积分的局部发散中提取。我们还提出了两种方法来减少张量结构,可用于计算局部散度。第一种方法是基于维数移位,并且对于循环数为$L\le3$的积分非常强大。第二种方法是基于在$d_{\infty}$维子空间中的PV约简,并且它更适合于四个或更多个循环。

英文摘要:

We present an efficient algorithm to decompose the ultraviolet (UV) divergences of Feynman integrals to local divergences and various types of sub-divergences. With some reasonable assumptions the local divergences of Feynman integrals can be uniquely defined in dimensional regularization scheme. By an asymptotic expansion in the hard momenta, the computation of local and sub-divergences is reduced to the computation of local divergences of massless vacuum integrals. In theories with spin $\le\frac{1}{2}$, the beta functions and anomalous dimensions can be extracted directly from the local divergence of integrals. We also propose two methods to reduce the tensor structures which can be used in the computation of local divergence. The first method is based on dimensional shift and is extremely powerful for integrals with loop number $L\le3$. The second method is based on a PV reduction in a $d_{\infty}$ dimension subspace, and it is more suited in four and more loops.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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