Abstract
In this paper, we continue the study of the existence problem of compact Clifford–Klein forms from a cohomological point of view, which was initiated by Kobayashi–Ono and extended by Benoist–Labourie and the author. We give an obstruction to the existence of compact Clifford–Klein forms by relating a natural homomorphism from relative Lie algebra cohomology to de Rham cohomology with an upper-bound estimate for cohomological dimensions of discontinuous groups. From this obstruction, we derive some examples, e.g. \({{\text {SO}}}_0(p+r, q)/({{\text {SO}}}_0(p,q) \times {{\text {SO}}}(r))\,(p,q,r \ge 1, \ q{:}\,\text {odd})\) and \({{\text {SL}}}(p+q, {\mathbb {C}})/{{\text {SU}}}(p,q)\,(p,q \ge 1)\), of a homogeneous space that does not admit a compact Clifford–Klein form. To construct these examples, we apply Cartan’s theorem on relative Lie algebra cohomology of reductive pairs and the theory of \(\varepsilon \)-families of semisimple symmetric pairs.
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Morita, Y. A cohomological obstruction to the existence of compact Clifford–Klein forms. Sel. Math. New Ser. 23, 1931–1953 (2017). https://doi.org/10.1007/s00029-016-0295-1
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DOI: https://doi.org/10.1007/s00029-016-0295-1
Keywords
- Clifford–Klein form
- Discontinuous group
- Pseudo-Riemannian manifold
- Relative Lie algebra cohomology
- \(\varepsilon \)-Family of semisimple symmetric pair