Please contact Vaibhav Gadre or Saul Schleimer if you would like to speak or suggest a speaker.
Friday January 9, 14:00, room MS.05 Jean Raimbault (Toulouse) Homology of hyperbolic threemanifolds and analytical torsion 
Abstract: In this talk I'll try to survey recent work on the integral homologies of hyperbolic threemanifolds of finite volume, essentially in the two following directions :
I will begin by giving a quick account of the conjectural picture surrounding the two items above. Then I will describe analytic tools (analytic torsion and the CheegerMüller Theorem) that can be applied to prove analogues of it for the homology with twisted coefficients, first in the case of compact manifolds (this is due to BergeronVenkatesh), and then in the general case of manifolds with cusps. 
Thursday January 22, 15:00, room MS.04 Arnaud Chéritat (Toulouse/Bordeaux/CNRS) Yet another sphere eversion 
Abstract: Smale proved in the 1960's that one can turn the sphere inside out in euclidean 3space, via a sequence of immersions. However, he did not give an explicit description of the necessary regular homotopy. Since then many people have given explicit sphere eversions. I will give a brief history and will then describe a, possibly new, way to turn the sphere inside out. 
Thursday January 29, 15:00, room MS.04 Mark Bell (Warwick) Conjugacy done quickly 
Abstract: We will look at the conjugacy problem for the mapping class group of a surface. In particular, we will discuss an effective solution using train tracks and the action of the mapping class group on the space of measured laminations. 
Thursday February 12, 15:00, room MS.04 David Epstein (Warwick) Multidimensional splines, Tarski's quantifier elimination, and manifold learning 
Abstract: Suppose $Z \subset \RR^n$ is finite: for example, the data points recorded from a scientific experiment. When the underlying natural laws are well behaved the points of $Z$ are sampled, with some noise, from a smoothly embedded, connected, compact manifold $M$ of dimension $m$ much less than $n$. We wish to recover an approximation of the unknown manifold $M$, knowing only $Z$. No procedure will work on all examples. Nonetheless, we may try the following.

Thursday February 19, 15:00, room MS.04 Brian Bowditch (Warwick) Large scale geometry of Teichmüller space and mapping class groups 
Abstract: We describe a number of results regarding the coarse rank and quasiisometric rigidity of various spaces associated to a compact surface. Of particular interest are the mapping class group (viewed as a geometric object) as well as Teichmüller space in the Teichmüller or WeilPeterson metrics. Some of this reproves known results by several authors, though other results appear to be new. The general theme is that these spaces all admit a certain ``coarse median'' structure, which allows much of this material to be put in a unified framework. A basic idea was originally inspired by constructions of Behrstock and Minsky. 
Thursday February 26, 15:00, room MS.04 Martin Möller (Frankfurt) Teichmüller curves in genus three and unlikely intersections 
Abstract: The group $\SL_2(\RR)$ acts on the moduli space of flat surfaces and, after the solution of the Ratnertype question by EskinMirzakhaniMohammadi, the classification problem for orbit closures is the main open question. For almost a decade no new examples of onedimensional orbit closures, that is, Teichmüller curves, have been found. In this talk we present various techniques to rule out the existence of Teichmüller curves. Besides geometric arguments, we use one numbertheoretic result: we extend the theory of unlikely intersections from the multiplicative group $G_m$ to products with $G_a$ factors. 
Thursday March 5, 15:00, room MS.04 Peter Haïssinsky (Toulouse) Quasiisometric rigidity of the class of convexcocompact Kleinian groups 
Abstract: The talk will be devoted to discussing background and ingredients for the proof of the following theorem: a finitely generated group quasiisometric to a convexcocompact Kleinian group contains a finite index subgroup isomorphic to a convexcocompact Kleinian group. 
Thursday March 12, 15:00, room MS.04 TBA (TBA) TBA 
Abstract: TBA 