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arXiv 1611.07005hep-th
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量子引力中的背景标度沃德恒等式

The background scale Ward identity in quantum gravity

Roberto Percacci, Gian Paolo Vacca

摘要:

我们表明,与适当的选择参数化,规范固定和截止,异常变化的有效作用下的全球重新标度的背景度规是相同的导数相对于截止,即β功能,定义的确切RG方程。可以将沃德恒等式和RG方程相结合,得到在全局背景重新标度下明显不变的修改的流动方程。

英文摘要:

We show that with suitable choices of parametrization, gauge fixing and cutoff, the anomalous variation of the effective action under global rescalings of the background metric is identical to the derivative with respect to the cutoff, i.e. to the beta functional, as defined by the exact RG equation. The Ward identity and the RG equation can be combined, resulting in a modified flow equation that is manifestly invariant under global background rescalings.

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