• Corpus ID: 119459271

On K(E_9)

  title={On K(E\_9)},
  author={Hermann Nicolai and H. Samtleben},
  journal={arXiv: High Energy Physics - Theory},
We study the maximal compact subgroup K(E_9) of the affine Lie group E_9(9) and its on-shell realization as an R symmetry of maximal N=16 supergravity in two dimensions. We first give a rigorous definition of the group K(E_9), which lives on the double cover of the spectral parameter plane, and show that the infinitesimal action of K(E_9) on the chiral components of the bosons and the fermions is determined in terms of an expansion of the Lie algebra of K(E_9) about the two branch points of… 

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