Events at the Centre for Symmetri and Deformation.

26 June 2017,
15:1516:15
Talk by Arthur Soulie (University of Strasbourg) Title: Action of the LongMoody Construction on Polynomial FunctorsAbstract: In 2015, RandalWilliams and Wahl proved homological stability with certain twisted coefficients for dif ferent families of groups, in particular the one of braid groups. In fact, they obtain the stability for coefficients given by functors satisfying polynomial conditions. We only know few examples of such functors. Among them, we have the functor given by the unreduced Burau representations. In 1994, Long and Moody gave a construction on representations of braid groups which associates a representation of Bn with a representation of Bn+1. This construction complexifies in a sense the initial representation: for instance, starting from a dimension one representation, one obtains the unreduced Burau representation. In this talk, I will present this construction from a functorial point of view. I will explain that the construction of Long and Moody defines an endofunctor, called the LongMoody functor, between a suitable category of functors. Then, after defining strong polynomial functors in this context, I will prove that the LongMoody functor increases by one the degree of strong polynomiality of a strong polynomial functor. Thus, the LongMoody construction will provide new examples of twisted coefficients corresponding to the framework of RandalWilliams and Wahl.
» Read more

26 June  30 June 2017
Masterclass with Matthew Morrow (JussieuParis) and Thomas Nikolaus (MPI Bonn).
» Read more

23 June 2017,
13:15
Specialeforsvar ved Anne Gregersen
» Read more

19 June 2017,
15:1516:15
Talk by Alexander Kupers (Copenhagen University) Title: Diffeomorphisms of disks Abstract: Disks are arguably the most basic manifolds. I will explain what is known about their diffeomorphisms groups in dimension at least 5, and discuss recent progress in understanding their rational homotopy groups. In particular, I will explain why these are degreewise finitelygenerated when n is not 4, 5 or 7.
» Read more

16 June 2017,
14:3015:30
Talk by Ionica Smeets (Leiden University)
» Read more

15 June 2017,
13:1514:15
Ariyan Javanpeykar (Mainz) will speak about Arithmetic, algebraic, and analytic hyperbolicity.
» Read more

14 June 2017,
15:15
Seminar talk by Sarah Browne (University of Sheffield) on An orthogonal quasispectrum for graded Etheory.
» Read more

13 June 2017,
15:1516:15
Peter Sarnak, Professor at Princeton University & the Institute for Advanced Study, will talk about "Navigating U(2) with Golden Gates"
» Read more

12 June 2017,
15:1516:15
Title: Stability for Singular Configuration Spaces
» Read more

7 June 2017,
15:15
Seminar talk by Claire Debord (ClermontFerrand) on Blowup and deformation groupoids related to index problems.
» Read more

29 May 2017,
15:1516:15
Talk by Agnes Beaudry (University of Colorado).
» Read more

24 May 2017,
15:1516:15
Seminar talk given by Elizabeth Gillaspy (University of Muenster):"Wavelets and spectral triples for higherrank graphs"
» Read more

22 May 2017,
15:1516:15
Talk by Cristiano Spotti (Aarhus) Title: Explicit degenerations of KählerEinstein Fano manifoldsAbstract: I will discuss the problem of studying examples of GromovHausdorff limits of Fano manifolds equipped with KählerEinstein metrics, explaining the relevance of these investigations to the existence problem for such metrics in explicit families, as well as to the study of compact moduli of stable Fano varieties. This talk is based on joint work with Song Sun.
» Read more

19 May 2017,
14:1515:15
Talk by Simona Settepanella (Hokkaido University). Title: Intersection lattice of Discriminantal arrangement and hypersurfaces in Grassmannian.
» Read more

17 May 2017,
15:1516:15
Seminar talk given by Rasmus Bentmann (University of Göttingen): "
Correspondences out of graph C*algebras"
» Read more

15 May 2017,
15:1516:15
Title: Motivic Homotopy Theory over deeper bases
» Read more

11 May 2017,
14:0015:00
Lecture in Masterclass: Cohomology of arithmetic groups by Alexander Kupers (Copenhagen University). Title: Computing K_8(Z)
» Read more

11 May 2017,
11:3012:30
Lecture in Masterclass: Cohomology of arithmetic groups by Alexander Kupers (Copenhagen University). Title: Computing K_8(Z)
» Read more

11 May 2017,
10:0011:00
Cohomology of arithmetic groups by Andy Putman (Notre Dame).
» Read more

10 May 2017,
11:3012:30
Lecture in Masterclass: Cohomology of arithmetic groups by Bena Tshishiku (Harvard University). Title: Geometric cycles
» Read more

10 May 2017,
10:0011:00
Cohomology of arithmetic groups by Andy Putman (Notre Dame). Title: Buildings, duality, and the highdimensional cohomology of arithmetic groups
» Read more

9 May 2017,
14:0015:00
Cohomology of arithmetic groups by Orsola Tommasi (Chalmers University of Technology and University of Gothenburg).
» Read more

9 May 2017,
11:3012:30
Cohomology of arithmetic groups by Orsola Tommasi (Chalmers University of Technology and University of Gothenburg).
» Read more

9 May 2017,
10:0011:00
Cohomology of arithmetic groups by Andy Putman (Notre Dame). Title: Buildings, duality, and the highdimensional cohomology of arithmetic groups.
» Read more

8 May  11 May 2017
The Masterclass will consist of two lecture series by Andy Putman and Harald Grobner, as well as a number of contributed talks about current research.
» Read more