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arXiv 0704.2840hep-th
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算子行列式高阶导数扰动的改进Schwinger-DeWitt方法

Improved Schwinger-DeWitt techniques for higher-derivative perturbations of operator determinants

Damiano Anselmi, Anna Benini

摘要:

我们考虑弯曲空间中量子引力和量子场论的高阶导数扰动,并研究计算费曼图的反项和短程展开的工具。在单高阶导数插入的情况下,我们推导出一个封闭的公式,该公式将扰动的单圈反项与未扰动的Schwinger-DeWitt系数联系起来。在更一般的情况下,我们分类的贡献,短距离扩展和概述了一些简化方法。某些困难的共同的微分技术在存在较高的导数扰动避免了系统使用的坎贝尔-贝克-豪斯多夫公式,这在某些情况下,大大减少了计算工作量。

英文摘要:

We consider higher-derivative perturbations of quantum gravity and quantum field theories in curved space and investigate tools to calculate counterterms and short-distance expansions of Feynman diagrams. In the case of single higher-derivative insertions we derive a closed formula that relates the perturbed one-loop counterterms to the unperturbed Schwinger-DeWitt coefficients. In the more general case, we classify the contributions to the short-distance expansion and outline a number of simplification methods. Certain difficulties of the common differential technique in the presence of higher-derivative perturbations are avoided by a systematic use of the Campbell-Baker-Hausdorff formula, which in some cases reduces the computational effort considerably.

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