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arXiv 1701.02422hep-th
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简化的量子引力双圈重整化

Two-Loop Renormalization of Quantum Gravity Simplified

Zvi Bern, Huan-Hang Chi, Lance Dixon, Alex Edison

摘要:

最近的研究表明,当在(非超对称)引力理论中加入非动力学的三种形式时,或者当赝标量被反对称的二种形式场所取代时,(非超对称)引力理论的维数正则化的二圈R^3发散系数会发生变化。这种现象涉及倏逝算子,其矩阵元素在四维中消失,包括高斯-博内算子,其也与迹线异常有关。另一方面,这些影响似乎没有重整化散射过程中的物理后果。特别地,两圈四引力子散射振幅对重整化尺度的依赖关系是简单的。在本文中,我们解释了任何最小耦合无质量引力理论与重整化物质相互作用的四维使用么正性切割,从来没有调用倏逝算子的结果。

英文摘要:

The coefficient of the dimensionally regularized two-loop R^3 divergence of (nonsupersymmetric) gravity theories has recently been shown to change when non-dynamical three forms are added to the theory, or when a pseudo-scalar is replaced by the anti-symmetric two-form field to which it is dual. This phenomenon involves evanescent operators, whose matrix elements vanish in four dimensions, including the Gauss-Bonnet operator which is also connected to the trace anomaly. On the other hand, these effects appear to have no physical consequences in renormalized scattering processes. In particular, the dependence of the two-loop four-graviton scattering amplitude on the renormalization scale is simple. In this paper, we explain this result for any minimally-coupled massless gravity theory with renormalizable matter interactions by using unitarity cuts in four dimensions and never invoking evanescent operators.

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