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  • 9 - Nilmanifolds

  • M. J. D. Hamilton, Universität Stuttgart, D. Kotschick, Ludwig-Maximilians-Universität München
  • Book:
    Künneth Geometry
    Published online:
    07 December 2023
    Print publication:
    21 December 2023, pp 123-150

  • Summary

    This chapter contains a brief introduction to nilmanifolds, and a discussion of Künneth and related structures on nilmanifolds. Nilmanifolds are homogeneous spaces for nilpotent Lie groups, and for them the discussions of geometric structures can often be reduced to the consideration of left-invariant structures. Left-invariant structures in turn arise from the corresponding linear structures on the Lie algebra, and these linear structures are usually much more tractable than arbitrary geometric structures on smooth manifolds. The nilmanifolds of abelian Lie groups are just tori, so that in some sense nilmanifolds are the simplest generalisations of tori.

    We do not give a systematic treatment of nilmanifolds here, but focus on providing a few explicit examples of Künneth structures, of hypersymplectic structures, and of Anosov symplectomorphisms in this setting. For more information on topics from the theory of nilmanifolds that we treat rather breezily, we refer to the books by Gorbatsevich, Onishchik and Vinberg [GOV-97] and by Knapp [Kna-96].