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arXiv 1104.0816hep-th
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可积自旋链与散射振幅

Integrable spin chains and scattering amplitudes

J. Bartels, L. N. Lipatov, A. Prygarin

摘要:

在这篇综述中,我们表明,多粒子散射振幅在N=4 SYM在大Nc和在多Regge运动学的一些物理区域具有高能量的行为出现从相应的t通道分波的复角动量平面中的Mandeltant切割的贡献。这些Mandelivery切割或Regge切割是由规范群SU(Nc)的伴随表示中的胶子复合态产生的。在主导对数近似(LLA)中,它们对六点振幅的贡献与已知的双环结果完全一致。在LLA中由n个胶子构造的Mandelivery态的哈密顿量与可积开自旋链的定域哈密顿量一致。我们构造相应的波函数使用的运动积分和Sklyanin的方法。

英文摘要:

In this review we show that the multi-particle scattering amplitudes in N=4 SYM at large Nc and in the multi-Regge kinematics for some physical regions have the high energy behavior appearing from the contribution of the Mandelstam cuts in the complex angular momentum plane of the corresponding t-channel partial waves. These Mandelstam cuts or Regge cuts are resulting from gluon composite states in the adjoint representation of the gauge group SU(Nc). In the leading logarithmic approximation (LLA) their contribution to the six point amplitude is in full agreement with the known two-loop result. The Hamiltonian for the Mandelstam states constructed from n gluons in LLA coincides with the local Hamiltonian of an integrable open spin chain. We construct the corresponding wave functions using the integrals of motion and the Baxter-Sklyanin approach.

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