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arXiv 1603.03440hep-thgr-qchep-ph
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无限导数场论和无鬼引力中的高能散射

High-Energy Scatterings in Infinite-Derivative Field Theory and Ghost-Free Gravity

Spyridon Talaganis, Anupam Mazumdar

摘要:

在本文中,我们将考虑散射图的上下文中的无限导数理论。首先,我们研究了有限阶高阶导数标量场,发现在大外动量的情况下,我们不能消除散射图的外动量发散。然后,我们采用一个无限导数标量玩具模型,并获得了外动量变得很大时,散射图的外动量依赖性是收敛的。为了消除外部动量发散,必须通过考虑重整化传播子和对裸顶点的顶点环修正来修饰散射图的裸顶点。最后,我们研究了一个标量玩具模型的背景下,这是由一个$\mathit{ghost-free}$和$\mathit{singularity-free}$无穷导数引力理论的启发,其中我们得出的结论,无穷导数可以消除散射图的外部动量发散,并使散射图收敛在紫外线。

英文摘要:

In this paper, we will consider scattering diagrams in the context of infinite-derivative theories. First, we examine a finite-order higher-derivative scalar field theory and find that we cannot eliminate the external momentum divergences of scattering diagrams in the regime of large external momenta. Then, we employ an infinite-derivative scalar toy model and obtain that the external momentum dependence of scattering diagrams is convergent as the external momenta become very large. In order to eliminate the external momentum divergences, one has to dress the bare vertices of the scattering diagrams by considering renormalised propagator and vertex loop corrections to the bare vertices. Finally, we investigate scattering diagrams in the context of a scalar toy model which is inspired by a $\mathit{ghost-free}$ and $\mathit{singularity-free}$ infinite-derivative theory of gravity, where we conclude that infinite derivatives can eliminate the external momentum divergences of scattering diagrams and make the scattering diagrams convergent in the ultraviolet.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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