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arXiv 2210.02583hep-thgr-qc
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高阶导数引力中的单圈发散

One-loop divergences in higher-derivative gravity

Nobuyoshi Ohta

AI总结:

本文综述高阶导数引力理论的单圈发散计算,给出一般公式与二次曲率项的显式结果,并证明无量纲耦合渐近自由且结果在壳上不依赖于度规参数化与规范。

摘要:

本文综述了高阶导数引力理论中的单圈发散。我们首先在任意背景下对量子涨落进行双线性展开,引入高阶导数规范固定,并证明高阶导数规范固定除了朴素预期的鬼场外,还必须存在额外的鬼场。我们给出了此类理论中单圈发散的一般公式,并给出了具有二次曲率项理论的显式结果。在此计算中,我们需要四阶导数极小算符和二阶导数非极小矢量算符的热核系数,文中对此进行了总结。我们还讨论了重整化群中的贝塔函数,并证明无量纲耦合是渐近自由的。该计算还被推广到具有任意$R$和$R_{μν}^2$函数的理论。我们证明了结果在壳上不依赖于度规参数化和规范选择。

英文摘要:

We give a review of the one-loop divergences in higher derivative gravity theories. We first make the bilinear expansion in the quantum fluctuation on arbitrary backgrounds, introduce a higher-derivative gauge fixing and show that higher-derivative gauge fixing must have ghosts in addition to those naively expected. We give general formulae for the one-loop divergences in such theories, and give explicit results for theories with quadratic curvature terms. In this calculation, we need the heat kernel coefficients for the four-derivative minimal operators and two-derivative nonminimal vector operators, which are summarized. We also discuss the beta functions in the renormalization group, and show that the dimensionless couplings are asymptotically free. The calculation is also extended to the theories with arbitrary functions of $R$ and $R_{μν}^2$. We show that the result is independent of metric parametrization and gauge on shell.

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