Events at the Centre for Symmetri and Deformation.
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26 June 2017,
15:15-16:15
Talk by Arthur Soulie (University of Strasbourg) Title: Action of the Long-Moody Construction on Polynomial FunctorsAbstract: In 2015, Randal-Williams 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 Long-Moody functor, between a suitable category of functors. Then, after defining strong polynomial functors in this context, I will prove that the Long-Moody functor increases by one the degree of strong polynomiality of a strong polynomial functor. Thus, the Long-Moody construction will provide new examples of twisted coefficients corresponding to the framework of Randal-Williams and Wahl.
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26 June - 30 June 2017
Masterclass with Matthew Morrow (Jussieu-Paris) and Thomas Nikolaus (MPI Bonn).
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23 June 2017,
13:15
Specialeforsvar ved Anne Gregersen
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19 June 2017,
15:15-16:15
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 finitely-generated when n is not 4, 5 or 7.
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16 June 2017,
14:30-15:30
Talk by Ionica Smeets (Leiden University)
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15 June 2017,
13:15-14:15
Ariyan Javanpeykar (Mainz) will speak about Arithmetic, algebraic, and analytic hyperbolicity.
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14 June 2017,
15:15
Seminar talk by Sarah Browne (University of Sheffield) on An orthogonal quasi-spectrum for graded E-theory.
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13 June 2017,
15:15-16:15
Peter Sarnak, Professor at Princeton University & the Institute for Advanced Study, will talk about "Navigating U(2) with Golden Gates"
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12 June 2017,
15:15-16:15
Title: Stability for Singular Configuration Spaces
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7 June 2017,
15:15
Seminar talk by Claire Debord (Clermont-Ferrand) on Blowup and deformation groupoids related to index problems.
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29 May 2017,
15:15-16:15
Talk by Agnes Beaudry (University of Colorado).
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24 May 2017,
15:15-16:15
Seminar talk given by Elizabeth Gillaspy (University of Muenster):"Wavelets and spectral triples for higher-rank graphs"
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22 May 2017,
15:15-16:15
Talk by Cristiano Spotti (Aarhus) Title: Explicit degenerations of Kähler-Einstein Fano manifoldsAbstract: I will discuss the problem of studying examples of Gromov-Hausdorff limits of Fano manifolds equipped with Kähler-Einstein 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.
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19 May 2017,
14:15-15:15
Talk by Simona Settepanella (Hokkaido University). Title: Intersection lattice of Discriminantal arrangement and hypersurfaces in Grassmannian.
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17 May 2017,
15:15-16:15
Seminar talk given by Rasmus Bentmann (University of Göttingen): "
Correspondences out of graph C*-algebras"
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15 May 2017,
15:15-16:15
Title: Motivic Homotopy Theory over deeper bases
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11 May 2017,
14:00-15:00
Lecture in Masterclass: Cohomology of arithmetic groups by Alexander Kupers (Copenhagen University). Title: Computing K_8(Z)
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11 May 2017,
11:30-12:30
Lecture in Masterclass: Cohomology of arithmetic groups by Alexander Kupers (Copenhagen University). Title: Computing K_8(Z)
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11 May 2017,
10:00-11:00
Cohomology of arithmetic groups by Andy Putman (Notre Dame).
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10 May 2017,
11:30-12:30
Lecture in Masterclass: Cohomology of arithmetic groups by Bena Tshishiku (Harvard University). Title: Geometric cycles
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10 May 2017,
10:00-11:00
Cohomology of arithmetic groups by Andy Putman (Notre Dame). Title: Buildings, duality, and the high-dimensional cohomology of arithmetic groups
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9 May 2017,
14:00-15:00
Cohomology of arithmetic groups by Orsola Tommasi (Chalmers University of Technology and University of Gothenburg).
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9 May 2017,
11:30-12:30
Cohomology of arithmetic groups by Orsola Tommasi (Chalmers University of Technology and University of Gothenburg).
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9 May 2017,
10:00-11:00
Cohomology of arithmetic groups by Andy Putman (Notre Dame). Title: Buildings, duality, and the high-dimensional cohomology of arithmetic groups.
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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.
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