Math Calendar

Tuesday, March 26, 2019
13:15-15:00
610
Master seminar Algebraic Topology - Yuqing Shi
Relative Sullivan algebras and a minimal model for the fiber of a map
15:30-16:00
HFG Library
Institute Tea
16:00-17:00
HFG 611
Utrecht Geometry Center Seminar
Christoph Winges (MPIM Bonn) - Coarse homology theories and assembly maps
Coarse homology theories provide an analog of homology theories which is adapted to the purposes of large-scale geometry. I will survey how they can be utilised to provide concrete models of assembly maps. As time allows, I will also explain an axiomatic framework which facilitates proofs of split-injectivity results for various assembly maps. This recovers known results eg for the algebraic K-theory of discrete group rings, but also accomodates invariants such as A-theory. Joint work with Ulrich Bunke, Alexander Engel and Daniel Kasprowski.
Thursday, March 28, 2019
16:00-17:00
Utrecht
Complex Systems Seminar
Cristian Spitoni (UU) - Nucleation for long-range Ising models, HFG 611
Title: Nucleation for long-range Ising models

Abstract:
In this talk we study the metastability phenomena for a class of "long-range" Ising models. We will start with the one-dimensional case, where, under suitable general conditions, the configuration -1 is the only metastable state. Moreover, we illustrate the theory with two examples (exponentially and polynomially decaying interaction) and we show that the critical droplet can be macroscopic or mesoscopic, according to the value of the external magnetic field. Heuristics and preliminary results for the two-dimensional case will be briefly discussed as well.
Monday, April 1, 2019
13:00-15:00
Duistermaat
Master Seminar Applications of Modular Forms
Mar Curco Iranzo - Isospectral manifolds and modular forms
13:00-15:00
HFG 610
Master Seminar Differential Geometry
Kevin Collins - Symplectic structures and foliations
Tuesday, April 2, 2019
15:30-16:00
HFG Library
Institute Tea
16:00-17:00
HFG 611
Utrecht Geometry Center Seminar
Stefano Marseglia (Universiteit Utrecht) - Abelian varieties over finite fields isogenous to a power
Abstract: Let A be an ordinary square-free abelian variety over a finite field. In this talk we will describe the category of abelian varieties isogenous to A^r in terms of R-modules, where R is an order in a certain étale algebra.
We will describe also polarizations and groups of automophisms. Under certain mild assumption on the order R, we will be able to effectively compute the abelian varieties up to isomorphism and in the case r=1 we can also list all polarizations of a fixed degree (up to polarized isomorphisms) with automorphism groups and period matrix of the canonical lift.
Wednesday, April 3, 2019
11:00-12:00
BBG 205
Inter-departemental Mathematical Physics Seminar
Hans Jockers (Universität Bonn) - Mirror Symmetry of Branes and the Quest of Hyperbolic 3-manifolds

Abstract: "Mirror symmetry is a powerful dualitybetween type II string compactifications on a pair of mirror dual Calabi-Yaumanifolds. Apart from its relevance in determining non-perturbative correctionsto the low energy effective action and in computing enumerative invariants ofCalabi-Yau manifolds, mirror symmetry also predicts an equivalence between theset of D-brane states appearing in such a pair of mirror dual Calabi-Yaucompactifications. In this talk we review some general aspects of mirrorsymmetry on the level of D-branes. We give evidence and illustrate with anexample that for particular classes of D-branes in Calabi-Yau 3-folds thecorresponding mirror branes in the mirror geometry are associated withhyperbolic 3-manifolds.”

Monday, April 8, 2019
13:00-15:00
Duistermaat
Master Seminar Applications of Modular Forms
Evelien van Dijk - Introduction to sphere packings
13:00-15:00
HFG 610
Master Seminar Differential Geometry
Santiago Quintero De Los Rios - Principal connections
Tuesday, April 9, 2019
15:30-16:00
HFG Library
Institute Tea
16:00-17:00
HFG 611
Utrecht Geometry Center Seminar
Noah Arbesfeld - t.b.a.
Thursday, April 11, 2019
16:00-17:00
Utrecht
Complex Systems Seminar
Felix Beckebanze (UU) - TBA, HFG 611
Monday, April 15, 2019
13:00-15:00
HFG 610
Master Seminar Differential Geometry
TBA - Connections compatible with G-structures
Tuesday, April 16, 2019
15:30-16:00
HFG Library
Institute Tea
16:00-17:00
HFG 611
Utrecht Geometry Center Seminar
David Carchedi (MPIM Bonn) - t.b.a.
Tuesday, April 23, 2019
15:30-16:00
HFG Library
Institute Tea
16:00-17:00
HFG 611
Utrecht Geometry Center Seminar
Manuel Krannich (Cambridge) - t.b.a.
Monday, April 29, 2019
13:00-15:00
HFG 610
Master Seminar Differential Geometry
TBA - Intrinsic torsion of a G-structure
13:00-15:00
HFG 610
Master Seminar Differential Geometry
TBA - Intrinsic curvature and higher torsions of a G-structure
Tuesday, April 30, 2019
15:30-16:00
HFG Library
Institute Tea
16:00-17:00
HFG 611
Utrecht Geometry Center Seminar
t.b.a. - t.b.a.
Thursday, May 2, 2019
16:00-17:00
Utrecht
Complex Systems Seminar
Patrick Dondl (Universität Freiburg) - TBA, HFG 611
Monday, May 6, 2019
13:00-15:00
HFG 610
Master Seminar Differential Geometry
TBA - Structure function of a G-structure and local equivalence
Tuesday, May 7, 2019
15:30-16:00
HFG Library
Institute Tea
16:00-17:00
HFG 611
Utrecht Geometry Center Seminar
Danica Kosanovic (MPIM Bonn) - t.b.a.
Thursday, May 9, 2019
16:00-17:00
Utrecht
Complex Systems Seminar
Antonella Ritorto (UU) - TBA, HFG 611
Monday, May 13, 2019
13:00-15:00
HFG 610
Master Seminar Differential Geometry
TBA - Prolongations of Lie algebras, Lie groups and G-structures
Tuesday, May 14, 2019
15:30-16:00
HFG Library
Institute Tea
16:00-17:00
HFG 611
Utrecht Geometry Center Seminar
Katrina Barron (University of Notre Dame) - t.b.a.
Monday, May 20, 2019
13:00-15:00
HFG 610
Master Seminar Differential Geometry
TBA - Integrability theorem for G-structures of finite type
Tuesday, May 21, 2019
15:30-16:00
HFG Library
Institute Tea
16:00-17:00
HFG 611
Utrecht Geometry Center Seminar
Adrien Sauvaget (UU) - Counting geodesics on flat surfaces
Description:We will present a universal formula for the growth rate of geodesics between
two conical singularities of a flat surface. The proof of this formula involves
both ingredients from representation theory via the Bloch-Okounkov formalism
and from intersection theory on moduli spaces.
Thursday, May 23, 2019
15:30-16:30
The 5th Daniel Kan Memorial Lectures
Fabien Morel (LMU) - A^1-algebraic topology; basic ideas and results
Tuesday, May 28, 2019
15:30-16:00
HFG Library
Institute Tea
16:00-17:00
HFG 611
Utrecht Geometry Center Seminar
Ling Long (Penn State/MPIM) - t.b.a.
Tuesday, June 4, 2019
15:30-16:00
HFG Library
Institute Tea
16:00-17:00
HFG 611
Utrecht Geometry Center Seminar
Hana Kourimska (TU Berlin) - t.b.a.
Thursday, June 6, 2019
16:00-17:00
Utrecht
Complex Systems Seminar
Michal Branicki (Edinburgh) - TBA, HFG 611
Tuesday, June 11, 2019
15:30-16:00
HFG Library
Institute Tea
16:00-17:00
HFG 611
Utrecht Geometry Center Seminar
Victor Kac (MIT) - t.b.a.
Tuesday, June 18, 2019
15:30-16:00
HFG Library
Institute Tea
16:00-17:00
HFG 611
Utrecht Geometry Center Seminar
Juan Cuadra Díaz (Universidad de Almería) - t.b.a.
Thursday, June 20, 2019
16:00-17:00
Utrecht
Complex Systems Seminar
Ajinkya Kadu (UU) - A convex formulation for Binary Tomography, HFG 611
Tuesday, June 25, 2019
15:30-16:00
HFG Library
Institute Tea
16:00-17:00
HFG 611
Utrecht Geometry Center Seminar
t.b.a. - t.b.a.
Tuesday, July 2, 2019
15:30-16:00
HFG Library
Institute Tea
Tuesday, July 9, 2019
15:30-16:00
HFG Library
Institute Tea
Tuesday, July 16, 2019
15:30-16:00
HFG Library
Institute Tea
Tuesday, July 23, 2019
15:30-16:00
HFG Library
Institute Tea
Tuesday, July 30, 2019
15:30-16:00
HFG Library
Institute Tea
Tuesday, August 6, 2019
15:30-16:00
HFG Library
Institute Tea
Tuesday, August 13, 2019
15:30-16:00
HFG Library
Institute Tea
Tuesday, August 20, 2019
15:30-16:00
HFG Library
Institute Tea
Tuesday, August 27, 2019
15:30-16:00
HFG Library
Institute Tea
Tuesday, September 3, 2019
15:30-16:00
HFG Library
Institute Tea
Tuesday, September 10, 2019
15:30-16:00
HFG Library
Institute Tea
Tuesday, September 17, 2019
15:30-16:00
HFG Library
Institute Tea
Tuesday, September 24, 2019
15:30-16:00
HFG Library
Institute Tea