A Novel Long Range Spin Chain and Planar N=4 Super Yang-Mills

@article{Beisert2004ANL,
  title={A Novel Long Range Spin Chain and Planar N=4 Super Yang-Mills},
  author={Niklas Beisert and V. Dippel and Matthias Staudacher},
  journal={Journal of High Energy Physics},
  year={2004},
  volume={2004},
  pages={075-075}
}
We probe the long-range spin chain approach to planar N = 4 gauge theory at high loop order. A recently employed hyperbolic spin chain invented by Inozemtsev is suitable for the su(2) subsector of the state space up to three loops, but ceases to exhibit the conjectured thermodynamic scaling properties at higher orders. We indicate how this may be bypassed while nevertheless preserving integrability, and suggest the corresponding all-loop asymptotic Bethe ansatz. We also propose the local part… 

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