Sami Douba's Webpage

I am a Huawei Young Talents Program Fellow at the Institut des Hautes Études Scientifiques, under the mentorship of Fanny Kassel. Broadly speaking, I am interested in the representation theory of finitely generated infinite groups and its interactions with geometry, topology, dynamics, and commutative algebra.

I completed my Ph.D. in 2022 at McGill University, where I was supervised by Piotr Przytycki and Dmitry Jakobson.

I am co-organizing the 13th iteration of Young Geometric Group Theory (YGGT), to be held April 7-11, 2025, at the University of Copenhagen.

Here is my CV.

Email: douba at ihes dot fr

Publications and preprints

• Density of systoles of hyperbolic manifolds, with J. Huang, to appear in C. R. Math.
• Systoles of hyperbolic hybrids, to appear in Tunis. J. Math.
• Infinitely many commensurability classes of compact Coxeter polyhedra in H⁴ and H⁵, with N. Bogachev, and J. Raimbault, to appear in Adv. Math.
• Cubulated hyperbolic groups admit Anosov representations, with B. Fléchelles, T. Weisman, and F. Zhu, submitted.
• On regular subgroups of SL₃(R), with K. Tsouvalas, submitted.
• Geometric and arithmetic properties of Löbell polyhedra, with N. Bogachev, to appear in Alg. Geom. Top.
• A novel witness to incoherence of SL₅(Z), Proc. Am. Math. Soc (2024).
• Anosov groups that are indiscrete in rank one, with K. Tsouvalas, Int. Math. Res. Not. (2023)
• A hyperbolic lattice in each dimension with Zariski-dense surface subgroups, Proc. Am. Math. Soc (2023).
• Thin right-angled Coxeter groups in some uniform arithmetic lattices, Bull. London Math. Soc (2022).
• Proper CAT(0) actions of unipotent-free linear groups, to appear in J. Inst. Math. Jussieu.
• Virtually unipotent curves in some non-NPC graph manifolds, Internat. J. Algebra Comput. (2023).
• 2-Systems of arcs on spheres with prescribed endpoints, Mich. Math. J (2021).

• Unipotents and graph manifold groups, Ph.D. thesis (defended July 2022).