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arXiv 2004.10716hep-thgr-qc
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振幅与四维Gauss-Bonnet理论

Amplitudes and 4D Gauss-Bonnet Theory

James Bonifacio, Kurt Hinterbichler, Laura A. Johnson

摘要:

最近有人认为,可能有一个非平凡的四维极限的高维高斯-邦纳和洛夫洛克相互作用,这可能提供一个漏洞,允许新的四维引力理论,可能没有一个标准的拉格朗日。我们通过研究树级引力子散射振幅来研究这一说法,使我们能够独立于拉格朗日量得出结论。通过对高斯-博内理论的高维散射振幅取四维极限,我们发现了不同于广义相对论的四维振幅;然而,这些振幅并不是新的,因为它们都来自某些标量张量理论。在平坦空间周围不会导致无限强耦合的非平凡极限导致了$(\partialϕ)^4$理论。我们认为,除了由Lovelock理论直接构造的壳层上振幅外,在任何维度上都不可能存在六阶导数纯引力四点振幅.特别是,在四维空间中,不可能有新的这样的振幅超过广义相对论的振幅。我们还给出了在任意维下,在广义相对论和Gauss-Bonnet理论中引力子-引力子散射的自旋平均截面的一些新结果。

英文摘要:

It has recently been argued that there may be a nontrivial four-dimensional limit of the higher-dimensional Gauss--Bonnet and Lovelock interactions and that this might provide a loophole allowing for new four-dimensional gravitational theories, possibly without a standard Lagrangian. We investigate this claim by studying tree-level graviton scattering amplitudes, allowing us to draw conclusions independently of the Lagrangian. By taking four-dimensional limits of higher-dimensional scattering amplitudes of the Gauss--Bonnet theory, we find four-dimensional amplitudes that are different from general relativity; however, these amplitudes are not new since they all come from certain scalar-tensor theories. The nontrivial limit that does not lead to infinite strong coupling around flat space leads to $(\partialϕ)^4$ theory. We argue that there cannot be any six-derivative purely gravitational four-point amplitudes in any dimension other than those coming from Lovelock theory by directly constructing the on-shell amplitudes. In particular, there can be no new such amplitudes in four dimensions beyond those of general relativity. We also present some new results on the spin-averaged cross section for graviton-graviton scattering in general relativity and Gauss--Bonnet theory in arbitrary dimensions.

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