E(10) orbifolds

@article{Brown2004E10O,
  title={E(10) orbifolds},
  author={Jeffrey Brown and Surya Ganguli and Ori J. Ganor and Craig Helfgott},
  journal={Journal of High Energy Physics},
  year={2004},
  volume={0506},
  pages={057}
}
We study Z2 orbifolds of M-theory in terms of E10. We find a simple relation between the Z2 action on E10 and the imaginary root that corresponds [hepth/0401053] to the “twisted sector” branes. We discuss the connection between the Kac-Moody algebra DE10 and the “untwisted” sector, and we demonstrate how DE18 can describe both the untwisted and twisted sectors simultaneously. 

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