Geometry & Topology Seminar

Title: Commensurators of thin groups
Speaker: Mahan Mj (TIFR, Mumbai)
Date: 26 August 2019
Time: 4 pm
Venue: LH-1, Mathematics Department

A celebrated theorem of Margulis characterizes arithmetic lattices in terms of density of their commensurators. A question going back to Shalom asks the analogous question for thin subgroups. We shall report on work during the last decade or so and conclude with a recent development. In recent work with Thomas Koberda, we were able to show that for a large class of normal subgroups of rank one arithmetic lattices, the commensurator is discrete.


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Last updated: 16 Oct 2019