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arXiv 2005.08737hep-th
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一阶算子插入下热核迹的路径积分计算

Path integral calculation of heat kernel traces with first order operator insertions

Fiorenzo Bastianelli, Francesco Comberiati

摘要:

利用路径积分表示,研究了在热核的迹中插入一阶微分算子的广义热核系数。这些系数可用于研究重力异常,即应力张量守恒的异常。我们用路径积分方法计算了在非阿贝尔规范背景和二维、四维和六维平坦空间中理论的引力反常系数。在四维空间中,人们并不期望有真正的引力异常。然而,它们可能在中间阶段通过不能保持相应对称性的正则化方案来诱导。外尔费米子的迹线反常研究最近出现了一个有趣的例子。

英文摘要:

We study generalized heat kernel coefficients, which appear in the trace of the heat kernel with an insertion of a first-order differential operator, by using a path integral representation. These coefficients may be used to study gravitational anomalies, i.e. anomalies in the conservation of the stress tensor. We use the path integral method to compute the coefficients related to the gravitational anomalies of theories in a non-abelian gauge background and flat space of dimensions 2, 4, and 6. In 4 dimensions one does not expect to have genuine gravitational anomalies. However, they may be induced at intermediate stages by regularization schemes that fail to preserve the corresponding symmetry. A case of interest has recently appeared in the study of the trace anomalies of Weyl fermions.

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