Abstract
We prove a structure theorem for the isometry group \({\text {Iso}}(M,g)\) of a compact Lorentz manifold, under the assumption that a closed subgroup has exponential growth. We don’t assume anything about the identity component of \({\text {Iso}}(M,g)\), so that our results apply for discrete isometry groups. We infer a full classification of lattices that can act isometrically on compact Lorentz manifolds. Moreover, without any growth hypothesis, we prove a Tits alternative for discrete subgroups of \({\text {Iso}}(M,g)\).
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I warmly thank Pierre Py, Romain Tessera and Abdelghani Zeghib for enlightning conversations, and the referee for very valuable remarks.
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Frances, C. Isometry group of Lorentz manifolds: A coarse perspective. Geom. Funct. Anal. 31, 1095–1159 (2021). https://doi.org/10.1007/s00039-021-00585-1
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DOI: https://doi.org/10.1007/s00039-021-00585-1