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Éléments réguliers et représentations de Gelfand-Graev des groupes réductifs non connexes

Karine Sorlin (2004)

Bulletin de la Société Mathématique de France

Soient G un groupe algébrique réductif connexe défini sur 𝔽 q et  F l’endomorphisme de Frobenius correspondant. Soit σ un automorphisme rationnel quasi-central de G . Nous construisons ci-dessous l’équivalent des représentations de Gelfand-Graev du groupe G ˜ F = G F · σ , lorsque σ est unipotent et lorsqu’il est semi-simple. Nous montrons de plus que ces représentations vérifient des propriétés semblables à celles vérifiées par les représentations de Gelfand-Graev dans le cas connexe en particulier par rapport aux...

Equations in simple matrix groups: algebra, geometry, arithmetic, dynamics

Tatiana Bandman, Shelly Garion, Boris Kunyavskiĭ (2014)

Open Mathematics

We present a survey of results on word equations in simple groups, as well as their analogues and generalizations, which were obtained over the past decade using various methods: group-theoretic and coming from algebraic and arithmetic geometry, number theory, dynamical systems and computer algebra. Our focus is on interrelations of these machineries which led to numerous spectacular achievements, including solutions of several long-standing problems.

Expansion and random walks in SL d ( / p n ) : I

Jean Bourgain, Alex Gamburd (2008)

Journal of the European Mathematical Society

We prove that the Cayley graphs of SL d ( / p n ) are expanders with respect to the projection of any fixed elements in SL d ( ) generating a Zariski dense subgroup.

Expansion in finite simple groups of Lie type

Emmanuel Breuillard, Ben J. Green, Robert Guralnick, Terence Tao (2015)

Journal of the European Mathematical Society

We show that random Cayley graphs of finite simple (or semisimple) groups of Lie type of fixed rank are expanders. The proofs are based on the Bourgain-Gamburd method and on the main result of our companion paper [BGGT].

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