Kyoto Journal of Mathematics

On the Calabi–Markus phenomenon and a rigidity theorem for Euclidean motion groups

Ali Baklouti and Souhail Bejar

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In this article, we study the rigidity properties of deformation parameters of the natural action of a discontinuous subgroup ΓG, on a homogeneous space G/H, where H stands for a closed subgroup of a Euclidean motion group G:=On(R)Rn. That is, we prove the following local (and global) rigidity theorem: the parameter space admits a rigid (equivalently a locally rigid) point if and only if Γ is finite. Remarkably, it turns out that H is compact whenever Γ is infinite, which makes accessible the study of the corresponding parameter and deformation spaces and their topological and local geometrical features. This shows that the Calabi–Markus phenomenon occurs in this setting. That is, if H is a closed noncompact subgroup of G, then G/H does not admit a compact Clifford–Klein form, unless G/H itself is compact. We also answer a question posed by T. Kobayashi. That is, no homogeneous space G/H admits a noncommutative free group as a discontinuous group.

Article information

Kyoto J. Math., Volume 56, Number 2 (2016), 325-346.

Received: 30 September 2014
Revised: 24 December 2014
Accepted: 11 March 2015
First available in Project Euclid: 10 May 2016

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Zentralblatt MATH identifier

Primary: 22E27: Representations of nilpotent and solvable Lie groups (special orbital integrals, non-type I representations, etc.)
Secondary: 22E40: Discrete subgroups of Lie groups [See also 20Hxx, 32Nxx] 57S30: Discontinuous groups of transformations

Euclidean motion group proper action discontinuous subgroup deformation space rigidity


Baklouti, Ali; Bejar, Souhail. On the Calabi–Markus phenomenon and a rigidity theorem for Euclidean motion groups. Kyoto J. Math. 56 (2016), no. 2, 325--346. doi:10.1215/21562261-3478898.

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