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arXiv 1506.04589hep-thgr-qchep-phmath-phmath.MP
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超可重整化引力中的散射振幅

Scattering amplitudes in super-renormalizable gravity

Pietro Donà, Stefano Giaccari, Leonardo Modesto, Leslaw Rachwal, Yiwei Zhu

摘要:

我们明确地计算了树水平的壳层四引力子振幅在四,五和六个维度的本地和弱非本地引力理论,是二次的,Ricci和标量曲率与形状因子的d 'Alembertian算子之间插入。更具体地说,我们感兴趣的是可重整化的,超可重整化的或有限的理论。无论形状因子的显式形式如何,这些理论的散射振幅都与爱因斯坦引力的散射振幅相同。作为一种特殊情况,在Weyl共形引力场中,四个引力子的散射振幅同为零。使用场的重新定义,我们证明了结果是正确的任何数量的外部引力子(在壳层$n-$点函数),并在任何维度的一大类理论。然而,当黎曼张量中的二次算子在任何维度上被添加时(除了四维中的高斯-博内项),结果完全改变,并且散射振幅取决于作用中引入的所有形状因子。

英文摘要:

We explicitly compute the tree-level on-shell four-graviton amplitudes in four, five and six dimensions for local and weakly nonlocal gravitational theories that are quadratic in both, the Ricci and scalar curvature with form factors of the d'Alembertian operator inserted between. More specifically we are interested in renormalizable, super-renormalizable or finite theories. The scattering amplitudes for these theories turn out to be the same as the ones of Einstein gravity regardless of the explicit form of the form factors. As a special case the four-graviton scattering amplitudes in Weyl conformal gravity are identically zero. Using a field redefinition, we prove that the outcome is correct for any number of external gravitons (on-shell $n-$point functions) and in any dimension for a large class of theories. However, when an operator quadratic in the Riemann tensor is added in any dimension (with the exception of the Gauss-Bonnet term in four dimensions) the result is completely altered, and the scattering amplitudes depend on all the form factors introduced in the action.

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