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arXiv 2403.07064hep-th
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单圈弦振幅的Regge极限

Regge Limit of One-Loop String Amplitudes

Pinaki Banerjee, Lorenz Eberhardt, Sebastian Mizera

AI总结:

研究固定动量传递下2→2单圈弦振幅的高能极限,发现开弦振幅因图拓扑出现Regge衰减现象,通过幺正切割与鞍点分析提取极限,证明平面开弦振幅主导贡献可在任意圈阶提取,且主导Regge轨迹保持线性。

摘要:

我们研究了固定动量传递下2→2单圈弦振幅的高能极限。对于闭弦,正如Amati、Ciafaloni和Veneziano首次讨论的那样,振幅的高能行为可像场论中一样由Regge理论确定。然而,场论直觉对开弦振幅部分失效,其在高能极限下会根据图的拓扑结构表现出令人惊讶的渐近行为,我们称之为Regge衰减。我们通过幺正切割与鞍点分析相结合的方法提取Regge极限,发现平面开弦振幅的主导贡献足够简单,可在任意圈阶下提取,这使我们能在特定极限下对亏格展开进行重求和,并证明主导Regge轨迹在此极限下保持线性。

英文摘要:

We study the high-energy limit of $2 \to 2$ one-loop string amplitudes at fixed momentum transfer. For the closed string, the high-energy behaviour of the amplitudes can be determined from Regge theory just like in field theory, as was first discussed by Amati, Ciafaloni and Veneziano. However, field theory intuition partially breaks down for the open-string amplitude, where amplitudes can exhibit surprising asymptotics in the high-energy limit depending on the topology of the diagram. We call this phenomenon Regge attenuation. We extract Regge limits by a combination of unitarity cuts and saddle-point analysis. We show that the leading contribution of the planar open-string amplitude is sufficiently simple that we can extract it at any loop order. This allows us to resum the genus expansion in a certain limit and demonstrate that the leading Regge trajectory remains linear in that limit.

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