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arXiv 0905.2058hep-th
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动量空间量子几何中N=4 SYM的振幅

Amplitudes in the N=4 SYM from Quantum Geometry of the Momentum Space

Alexander Gorsky

摘要:

我们讨论了N=4 SYM理论中的多圈MHV振幅在动量空间中的有效引力与IR调节膜的自由度。外部粒子的运动学不变量产生复结构或Kahler结构的模空间,这是Kodaira-Spencer(KS)或Kahler型引力的运动场。我们建议在N=4 SYM理论中的环路MHV振幅的费米子表示,假设在B模型中的IR调节膜与KS费米子和A模型中的拉格朗日膜的识别。二易质量盒图在B模型的谱曲线或A模型的双曲体积上与费米子流的相关器有关,在整个图像中起着积木的作用。类似BDS的anzatz被解释为费米子相关器的半经典极限。证明了在模空间上,费米子表示蕴含着一种可积性。我们推测解释的雷金度的自由度的开放字符串之间的IR调节器膜拉伸。

英文摘要:

We discuss multiloop MHV amplitudes in the N=4 SYM theory in terms of effective gravity in the momentum space with IR regulator branes as degrees of freedom. Kinematical invariants of external particles yield the moduli spaces of complex or Kahler structures which are the playgrounds for the Kodaira-Spencer(KS) or Kahler type gravity. We suggest fermionic representation of the loop MHV amplitudes in the N=4 SYM theory assuming the identification of the IR regulator branes with KS fermions in the B model and Lagrangian branes in A model. The two-easy mass box diagram is related to the correlator of fermionic currents on the spectral curve in B model or hyperbolic volume in the A model and it plays the role of a building block in the whole picture. The BDS-like anzatz has the interpretation as the semiclassical limit of a fermionic correlator. It is argued that fermionic representation implies a kind of integrability on the moduli spaces. We conjecture the interpretation of the reggeon degrees of freedom in terms of the open strings stretched between the IR regulator branes.

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