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University of Cambridge > Talks.cam > Isaac Newton Institute Seminar Series > Benjamini-Schramm convergence of arithmetic orbifolds.

## Benjamini-Schramm convergence of arithmetic orbifolds.Add to your list(s) Download to your calendar using vCal - Mikolaj Fraczyk (Université Paris Saclay)
- Wednesday 19 April 2017, 10:00-11:00
- Seminar Room 2, Newton Institute.
If you have a question about this talk, please contact info@newton.ac.uk. NPC - Non-positive curvature group actions and cohomology Let X be the a symmetric space. We say that a sequence of locally symmetric spaces Benjamini-Schramm converges to X if for any real number R the fraction of the volume taken by the R-thin part tends to 0. In my thesis I showed that for a cocompact, congruence arithmetic hyperbolic 3-manifold the volume of the R-thin part is less than a power less than one of the total volume. As a consequence, any sequence of such manifolds Benjamini-Schramm converges to hyperbolic 3-space. I will give some topological applications of this result. Lastly, I will discuss Benjamini-Schramm convergence of congruence arithmetic orbifolds covered by the symmetric spaces of real rank 1. (joint work with Jean Raimbault). This talk is part of the Isaac Newton Institute Seminar Series series. ## This talk is included in these lists:- All CMS events
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