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arXiv 2003.14330hep-thmath-phmath.MP
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紧空间维理论中振幅色散关系的证明

Proof of dispersion relations for the amplitude in theories with a compactified space dimension

Jnanadeva Maharana

摘要:

研究了流形$\mathbb{R}^{3,1}\times S^1$中场论的非正向散射振幅的解析性质。本文首先考虑$D = 5$ Minkowski空间中质量$m_0$的标量场论。随后,一个空间维度被紧致化为一个圆。由此产生的理论的质量谱是:(a)一个大质量标量,$m_0$,与原始的五维理论相同;(b)一个大质量卡鲁扎-克莱因态的塔。我们推导出非前向色散关系的散射激发Kaluza-Klein状态的莱曼-Symanzik-Zimmermann制定的理论。为了实现这一目的,我们首先将Jost-Lehmann-Dyson定理推广到具有紧致空间维的相对论性场论。接下来,我们证明了莱曼-马丁椭圆的存在性,其中分波展开收敛。证明了当$|t|$位于Lehmann-Martin椭圆内时,散射振幅满足固定的$t$色散关系。

英文摘要:

The analyticity properties of the scattering amplitude in the nonforward direction are investigated for a field theory in the manifold $\mathbb{R}^{3,1}\times S^1$. A scalar field theory of mass $m_0$ is considered in $D = 5$ Minkowski space to start with. Subsequently, one spatial dimension is compactified to a circle. The mass spectrum of the resulting theory is: (a) a massive scalar of mass, $m_0$, same as the original five dimensional theory and (b) a tower of massive Kaluza-Klein states. We derive nonforward dispersion relations for scattering of the excited Kaluza-Klein states in the Lehmann-Symanzik-Zimmermann formulation of the theory. In order to accomplish this object, first we generalize the Jost-Lehmann-Dyson theorem for a relativistic field theory with a compact spatial dimension. Next, we show the existence of the Lehmann-Martin ellipse inside which the partial wave expansion converges. It is proved that the scattering amplitude satisfies fixed-$t$ dispersion relations when $|t|$ lies within the Lehmann-Martin ellipse.

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