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arXiv 2008.09996hep-thgr-qc
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紧化引力理论中的散射振幅

Scattering Amplitudes in Theories of Compactified Gravity

Dennis Foren

摘要:

本文讨论了紧致引力理论中描述自旋为2的大质量粒子散射的矩阵元的性质。我们的主要结果是在Randall-Sundrum 1(RS 1)模型中计算了2到2质量自旋2 Kaluza-Klein(KK)模散射矩阵元,并证明了这些矩阵元的增长不快于$\mathcal{O}(s)$,而与所考虑的KK模数和螺旋度无关。因为这种计算需要对无限多个自旋为2的介导图求和,每个图都像$\mathcal{O}(s^{5})$一样发散,所以只有通过这些图之间的抵消才能获得总的$\mathcal{O}(s)$增长。这反过来又需要无限多KK模式质量和耦合之间的复杂抵消。我们推导出这些求和规则,包括它们对完全非弹性过程的推广。我们还考虑这些矩阵元素在五维orbifolded环面(5 DOT)和大$kr_{c}$限制,调查的影响,包括只有有限多的图表在计算中(通过截断误差测量),并计算五维强耦合尺度$Λ_π \equiv M_{\text{Pl}}\, e^{-kr_{c}π}$通过四维散射计算。

英文摘要:

In this dissertation we discuss the properties of matrix elements describing the scattering of massive spin-2 particles in theories of compactified gravity. Our primary result is the calculation of 2-to-2 massive spin-2 Kaluza-Klein (KK) mode scattering matrix elements in the Randall-Sundrum 1 (RS1) model and the demonstration that those matrix elements grow no faster than $\mathcal{O}(s)$ irrespective of the KK mode numbers and helicities considered. Because this calculation requires summing infinitely-many spin-2 mediated diagrams which each diverge like $\mathcal{O}(s^{5})$, overall $\mathcal{O}(s)$ growth is only attained through cancellations between these diagrams. This in turn requires intricate cancellations between infinitely-many KK mode masses and couplings. We derive these sum rules, including their generalization to fully inelastic processes. We also consider these matrix elements in the five-dimensional orbifolded torus (5DOT) and large $kr_{c}$ limits, investigate the impact of including only finitely-many diagrams in the calculation (as measured via truncation error), and calculate the five-dimensional strong coupling scale $Λ_π \equiv M_{\text{Pl}}\, e^{-kr_{c}π}$ via the four-dimensional scattering calculation.

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