Joint Seminar on Complex Algebraic Geometry and Complex Analysis
(Bochum - Essen - Köln - Wuppertal)

Photo by Max Greve and Timo Bobert

The Seminar

The "Joint Seminar on Complex Algebraic Geometry and Complex Analysis" is a research seminar, organised by the algebraic and complex geometry research groups in Bochum, Essen, Cologne, and Wuppertal. The seminar meets roughly twice per semester for a full day in Bochum, Essen, Cologne, or Wuppertal. There are three talks per meeting, both by invited guests and by speakers from the organising universities. We aim to leave ample room for discussions.

The talks are open for everyone. Contact one of the organisers if you are interested in attending the meeting. We have some funds that might help to support travel for some junior participants.

Meetings of the seminar are partially supported by

  • SFB/TR 45 "Periods, moduli spaces and arithmetic of algebraic varieties"
  • SFB/TR 191 "Symplectic structures in geometry, algebra and dynamics"

Next Meeting


The next meeting will take place on Friday, November 23rd, 2018 in Bochum.


  • Ben Anthes (Marburg): Complex symplectic manifolds satisfying the del-delbar-Lemma

    I will report on joint work with Andrea Cattaneo, Adriano Tomassini and Sönke Rollenske on compact complex manifolds which satisfy the del-delbar-Lemma and which have trivial canonical bundle or which admit a nowhere degenerate holomorphic 2-form. For the former class, it turns out that the Albanese map is a fibration whose fibres have trivial canonical bundle as well. For the latter class, we study the period map and prove a local Torelli theorem. In the talk we will discuss these results and conclude with some related open problems.

  • Kevin Fritsch (Bochum): Equivariant embeddings for CR manifolds of high codimension

    One of the main questions for abstract CR manifolds is the embeddability into some complex linear or projective space, the most prominent result arguably being the embedding theorem of Boutet de Monvel for codimension one. I will give a short motivation for the study of CR manifolds of higher codimension with transversal group action and present some recent results on this topic similar to the Boutet de Monvel embedding theorem.

  • Ariyan Javanpeykar (Mainz): Demailly's notion of algebraic hyperbolicity

    A conjecture of Green-Griffiths-Lang predicts that "algebraically hyperbolic" projective varieties are "analytically hyperbolic". In particular, since "analytically hyperbolic" projective varieties have many properties (e.g., finite automorphism group), the same properties should be shared by "algebraically hyperbolic" projective varieties. In joint work with Ljudmila Kamenova we verify some of the properties predicted by Lang's conjecture, building on work of Hwang-Kebekus-Peternell. In this talk, we will first explain Lang's conjecture and all the different notions of hyperbolicity it relates, and show how to verify some of the predictions it makes.


10:30 - 11:30 Anthes

11:45 - 12:45 Javanpeykar

12:45 - 14:30 Lunch break

14:30 - 15:30 Fritsch


Ruhr-Universität Bochum
Fakultät für Mathematik

All talks will take place in Seminar Room NA 1 / 64.

How to find the seminar room: see the map on the following website.


Kevin Fritsch
Ruhr-Universität Bochum
kevin [dot] fritsch [at] rub [dot] de

Daniel Greb
Universität Duisburg-Essen
daniel [dot] greb [at] uni-due [dot] de

George Marinescu
Universität zu Köln
gmarines [at] math [dot] uni-koeln [dot] de

Jean Ruppenthal
Bergische Universität Wuppertal
jean [dot] ruppenthal [at] math [dot] uni-wuppertal [dot]de

Past Meetings

26.4.2013, Bochum: Tim Kirschner, Christian Miebach, Henrik Seppänen

28.6.2013, Wuppertal: Rafael Andrist, Immanuel Stampfli, Matei Toma

22.11.2013, Bochum: Sébastien Boucksom, Egmont Porten, Sönke Rollenske

24.1.2014, Wuppertal: Clemens Jörder, Helge Ruddat, Jörg Winkelmann

16.5.2014, Bochum: Alberto Abbondandolo, Judith Brinkschulte, Julius Ross

20.6.2014, Wuppertal: Julie Déserti, Slawomir Dinew, Slawomir Rams

24.10.2014, Bochum: Henri Guenancia, Shulim Kaliman, Adriano Tomassini

15.12.2014, Wuppertal: Richard Lärkäng, Christian Miebach, Marco Spinaci

7.5.2015, Essen: Brent Doran, Erwan Rousseau, Emanuel Scheidegger

15.6.2015, Bochum: Roya Beheshti, Daniel Greb, Hossein Raufi

27.11.2015, Wuppertal: Francesco Bei, Kai Cieliebak, Tyson Ritter

1.2.2016, Essen: Ursula Ludwig, George Marinescu, Wenhao Ou

25.4.2016, Wuppertal: Gian Maria Dall’Ara, Christian Lehn, Luca Tasin

26.6.2016, Cologne: Chin-Yu Hsiao, Stefan Nemirovski, Nikhil Savale

25.11.2016, Bochum: Ana-Maria Brecan, Antonio di Scala, Dan Popovici

27.1.2017, Essen: Tim Kirschner, Viêt Anh Nguyên, Stefan Schreieder

21.4.2017, Wuppertal: Vicente Cortés, Philipp Naumann, Markus Reineke

7.7.2017, Cologne: Roger Bielawski, Dan Coman, Martin Schwald

3.11.2017, Bochum: Junyan Cao, Sönke Rollenske, Robert Szöke

1.2.2018, Essen: Gilberto Bini, Ruadhaí Dervan, Hendrik Herrmann

27.4.2018, Wuppertal: Hugues Auvray, Bernd Stratmann, Michael Lennox Wong

6.7.2018, Cologne: Turgay Bayraktar, Jarek Buczynski, Andrew Dancer

23.11.2018, Bochum: Ben Anthes, Kevin Fritsch, Ariyan Javanpeykar