On Friday November 22, 2013 we will have the next BelgianDutch Algebraic Geometry day. This edition will take place at:
The lectures are given in the Huygens Building, room HG00.071 on the ground floor. Address: Heyendaalseweg 135, Nijmegen. The Huygens building is approximately 250 meters from train station Nijmegen Heyendaal. From Nijmegen central station it can also be reached by taking bus number 10, which takes only 5 minutes to the University. (Recommended stop: Huygensgebouw.) See also the map of the campus.
13:0014:00  Nero Budur (Leuven) 
Cohomology jump loci
Abstract: In practice, any deformation problem over fields of characteristic
zero is governed by a differential graded Lie algebra (DGLA).
Following Deligne, GoldmanMillson and Simpson described the local
structure of deformation spaces for various geometric situations.
Given an object with a notion of cohomology theory, how can one
describe all its deformations subject to cohomology constraints? We
will present an approach via DGLA pairs. As applications we discuss
the structure of cohomology jump loci of vector bundles and of local
systems. This is joint work with Botong Wang.

14:0014:30  Coffee break  
14:3015:30  Stefan Schröer (Düsseldorf) 
Wild quotient surface singularities
Abstract: I will discuss joint work with Hiroyuki Ito concerning wild quotient surface singularities. The main topic is the structure of the dual graph describing the exceptional divisor on the resolution of singularities. The results answers some questions posed by Lorenzini.

15:3016:00  Coffee break  
16:0017:00  René Schoof (Rome) 
Finite group schemes and abelian varieties with good reduction outside one prime
Abstract: The Jacobian J_{0}(23) of the modular curve
X_{0}(23) is a semistable abelian variety over Q with good reduction
outside 23. It is simple. We prove that every simple semistable abelian
variety over Q with good reduction outside 23 is isogenous over Q to J_{0}(23).

As usual, after the lectures we intend to go for an informal dinner in town.
For further information, please contact Ben Moonen, b.moonen at science.ru.nl, or +31 (0)24 3653220. We hope to see you on November 22!