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Spring School: Irregular Hodge Structures and Stability Conditions

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This is a Spring School of the SFB/TRR 45 Bonn-Essen-Mainz financed by the DFG (Deutsche Forschungsgemeinschaft). It will take place from February 29 until March 4, 2016 at the University of Mainz (Germany).

  • Spring School
When Feb 29, 2016 09:00 AM to
Mar 04, 2016 03:00 PM
Where Mainz, 05-432 (Hilbertraum) and 05-426
Contact Name
Contact Phone +49-[0]6131-3923606
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Classical Variations of Hodge structures give rise to bundles with connections that have logarithmic poles. Connections with higher order poles lead to a more general notion of Hodge structure which is called "irregular" or "non-commutative". The notion of irregularity refers to work of Deligne where he introduces exponential periods that indicate a non-integral, even irrational degree of their Hodge filtration, e.g. a period of \sqrt{\pi} indicates a Hodge degree of 1/2. Deligne also relates such periods to the cohomology of the twisted de Rham complex, i.e. the usual de Rham differential d is replaced by d+df for f a regular function. The more recent terminology "non-commutative" refers to the circumstance that such Hodge structures should appear as the natural Hodge structures to associate to noncommutative spaces. As suggested by Katzarkov-Kontsevich-Pantev, such spaces are represented by dg- or A_\infty-categories which appear for instance in homological mirror symmetry as Fukaya(-Seidel)-categories or categories of matrix factorisations. The purpose of this school is to provide the participants with working level skills of dealing with irregular Hodge structures and to generate familiarity with applications of these in homological mirror symmetry and enumerative geometry. Stability conditions on the associated categories can be thought of as an analogy of what polarisations do in complex geometry. They enable counting objects and such counts reappear in the Stokes data of the irregular connection of the associated Hodge structure - closing the circle that connects these concepts.



Tentative Schedule:

Registration: Monday, Feb 29, 9:00 - 9:30, Room 05-432 (Hilbertraum), 5th floor

Feb 29
Mar 1
Mar 2
Mar 3
Mar 4
9:30 - 10:30  Hertling  Hertling Stellari Reichelt Reichelt
11:00 - 12:00 Sabbah Sabbah Sabbah Sabbah Hoskins
12:00 - 14:00 Lunch break Lunch break Lunch break Lunch break Lunch break
14:00 - 15:00  Stellari Stellari guided wine
tour to
15:30 - 16:30  Stoppa Stoppa Stoppa
16:40-17:40 exercises:
Hodge theory &
Stokes data
Hodge theory & 
joint dinner at
map location


Course material

(prints of these will be provided)
  • Claus Hertling: course description and exercises pdf, solutions to exercise 2
  • Claude Sabbah: lecture notes and exercises pdf
  • Paolo Stellari: course description and exercises pdf
  • Victoria Hoskins: exercises with hints pdf
  • Jacopo Stoppa: course plan and exercises pdf

Excursion to Kloster Eberbach (monastery Eberbach)

Not far from Mainz is the famous Kloster Eberbach, site of the movie casting for "The Name of the Rose" after the well-known novel by recently deceased Umberto Eco. We booked for you a "strolling wine tasting tour" of the monastry on Wednesday afternoon. This is a combination of a guided tour with a wine tasting of six different classy regional Rieslings. We collect the symbolic contribution of 10 EUR from those interested in the event on Monday morning. A bus will pick us up at 2pm on Wednesday. The tour at the Kloster begins at 3pm and takes about 90 minutes. The bus will leave again from the monastry at 5pm to bring you back to the hotel.







Université de Lille 1
Universität Marburg
Università degli Studi di Pavia
Basalaev Alexey Universität Mannheim
Codogni Giulio Roma Tre
Cruz Morales John Alexander Max Planck Institute for Mathematics, Bonn
Dvirnas Albertas Lund University
Fatighenti Enrico University of Warwick
Feyzbakhsh Soheyla University of Edinburgh
Filippini Sara Angela Institut de Mathématiques de Marseille/Aix-Marseille Université
Fresán Javier ETH Zürich
Gauß Falko Universität Mannheim
Purdue University / Max Planck Institute for Mathematics, Bonn
Kirschner Tim Universität Duisburg-Essen
Komyo Arata Kobe University
Krämer Thomas École Polytechnique, Paris
Mamedova Firuza Universität Hannover
Meinhardt Sven Bergische Universität Wuppertal
Overholser Douglas Imperial College London
Rincón Hidalgo Alejandra Freie Universität Berlin
Sabonis Deividas TU München
Universität Augsburg
Sevenheck Christian Technische Universität Chemnitz
Shamoto Yota Kyoto University
Shklyarov Dmytro Technische Universität Chemnitz
Universität Augsburg
Sutherland Tom Università degli Studi di Pavia
Taro Sano Kobe University
Zhao Yan Universiteit Leiden / Università degli studi di Milano




If you have any questions related to the funding or the accommodation, please write to Jutta Gonska


Registration and Financial Support:

Full financial support is available for members of the SFB/TRR 45. There will be limited support for other participants, too.

Registration is possible until January 31, 2016, at the latest.


We have reserved a block of rooms at Hotel Hammer and Cityhotel Neubrunnenhof  and Advena Hotel Mainz, all hotels are located close to the main train station in Mainz. Participants are asked to please contact one of the hotels directly by stating the key word "Spring School University of Mainz". Please note, however, that the number of rooms is limited and rooms are allocated on a "first come - first serve" basis so early reservation is recommended.

Of course, it is possible to make reservations in other hotels as well. If you prefer that, we refer to the home page of the City of Mainz where you will find a detailed list of hotels in and around Mainz.


Travel information:

Closest airport is located at Frankfurt/Main. From there, there are frequent trains to Mainz central station (Hauptbahnhof).

The fastest way to the Institut fur Mathematik from the Hauptbahnhof (Mainz main railway station) is to take Bus line 69 which departs from platform F. Get off at "Duesbergweg", the Mathematics building is to your right behind the parking lot. (The walk is about 2 minutes.) The timetable for the Bus line 69 is here (please pay attention to the fact that the spring school takes place during a vorlesungsfrei period, i.e. you have to watch the last column).  

Alternatively, you may take bus lines 9, 54, 55, 58, 68; the bus stop is "Friedrich-von-Pfeiffer-Weg". From there, walk over the pedestrian bridge to the university campus and follow the street to the right. After about 100 meters there is a left curve. After passing the Mensa (campus cafeteria) you see the Mathematics building right in front of you. (The walk is about 10 minutes.)


All lectures will take place at the Institute of Mathematics of the University of Mainz, Staudinger Weg 9, in room 05-426 (fifth floor).

Coffee and registration will be in room 05-432 (Hilbertraum).