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arXiv 1708.08253hep-thgr-qchep-ph
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二阶曲率的引力有效Action与引力波

Gravitational Effective Action at Second Order in Curvature and Gravitational Waves

Xavier Calmet, Salvatore Capozziello, Daniel Pryer

摘要:

考虑了含非定域项的二阶曲率量子引力的完全有效理论。我们发现,该理论包含两个新的自由度以外的无质量引力子:即一个大规模的自旋2鬼和一个大规模的标量场。此外,我们还指出,由于有效作用量中的非定域项的存在,不可能通过微调有效作用量的参数来完全消除经典自旋2鬼。作为一个经典场,这个幽灵是否有问题还不清楚。它只是意味着对牛顿势的排斥贡献。然后,我们考虑如何提取的有效作用的参数,并表明,它是可能的测量,至少在原则上,相互独立的本地条款的参数使用的组合观测的引力波和测量进行的钟摆式实验寻找牛顿的潜在偏差。

英文摘要:

We consider the full effective theory for quantum gravity at second order in curvature including non-local terms. We show that the theory contains two new degrees of freedom beyond the massless graviton: namely a massive spin-2 ghost and a massive scalar field. Furthermore, we show that it is impossible to fine-tune the parameters of the effective action to eliminate completely the classical spin-2 ghost because of the non-local terms in the effective action. Being a classical field, it is not clear anyway that this ghost is problematic. It simply implies a repulsive contribution to Newton's potential. We then consider how to extract the parameters of the effective action and show that it is possible to measure, at least in principle, the parameters of the local terms independently of each other using a combination of observations of gravitational waves and measurements performed by pendulum type experiments searching for deviations of Newton's potential.

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