Isospectrality of flat Lorentz 3-manifolds.
Using methods of \textit{G. A. Margulis} [Zap. Nauchn. Semin. Leningr. Otd. Mat. Inst. Steklova 134, 190--205 (1984; Zbl 0547.57030)], the authors prove that the isometry of a hyperbolic flat Lorentzian 3-manifold is uniquely determined by its marked geodesic length spectrum. A similar result is obtained for flat Lorentzian 3-manifolds with free fundamental group. The first result has been generalised to arbitrary dimensions by Inkang Kim (unpublished when the review was written).
scientific article; zbMATH DE number 1782695