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Date: 6 – 7 November, 2025
Location: Utrecht Science Park
Registration
To attend the main symposium (Thursday and Friday morning), please register using the link below.
Register NowThe Friday afternoon program is open to all interested guests—no registration required for this part of the event.
We have limited support available towards the stay and travel of junior participants. Preference will be given to applicants who register before September 15, 2025.
Warning! Some participants have been contacted by scammers regarding travel details for the conference. Please be aware of this. When in doubt, contact the organizers.
Program
Thursday 6 November 2025
All talks on Thursday take place in room Atlas, Koningsberger building.
| 10:30 – 11:00 | welcome + coffee |
| 11:00 – 12:00 | [Talk 1 Title] Jennifer Balakrishnan, Boston University
To be announced.
|
| 12:00 – 13:30 | lunch break |
| 13:30 – 14:30 | [Talk 2 Title] Ching-Li Chai, University of Pennsylvania
To be announced.
|
| 14:30 – 15:00 | coffee break |
| 15:00 – 16:00 | [Talk 3 Title] Emma Brakkee, Leiden University
To be announced.
|
| 16:00 – 16:30 | coffee break |
| 16:30 – 17:30 | [Talk 4 Title] Jakob Stix, Frankfurt University
To be announced.
|
Friday 7 November 2025
The talks on Friday morning take place in room Cosmos, Koningsberger building.
| 09:30 – 10:30 | Failure of the integral Hodge conjecture for abelian varieties Olivier de Gaay Fortman, Utrecht University We disprove the integral Hodge conjecture for abelian varieties and show that very general cubic threefolds are not stably rational. More precisely, we prove that the cohomology class of any curve on a very general principally polarized abelian variety of dimension at least four over the complex numbers is an even multiple of the minimal class, and that the same holds for the intermediate Jacobian of a very general cubic threefold. This is joint work with Philip Engel and Stefan Schreieder.
|
| 10:30 – 11:00 | coffee break |
| 11:00 – 12:00 | [Talk 6 Title] Valentijn Karemaker, University of Amsterdam
To be announced.
|
| 12:00 – 13:30 | lunch break |
|
Note: The Friday afternoon program (13:30–17:30) is open to all interested guests and features talks aimed at a general mathematical audience. No registration is required if you only wish to attend this part of the event. The talks on Friday afternoon take place in room Boothzaal, in the University Library on Utrecht Science Park. | |
| 13:30 – 14:30 | [Talk 7 Title] Jaap Top, University of Groningen
To be announced.
|
| 14:30 – 15:00 | coffee break |
| 15:00 – 16:00 | [Talk 8 Title] Don Zagier, MPIM Bonn
To be announced.
|
| 16:00 – 17:30 | reception (Cafe The Living, Utrecht Science Park) |
Location
This symposium takes place on Utrecht Science Park, which is a short tram ride from Utrecht Central station, with excellent train connections to many other Dutch cities.
On Thursday, we use room Atlas in the Koningsberger building. On Friday morning, we will be in room Cosmos of the same Koningsberger building. The Friday afternoon program takes place in the Boothzaal, in the University Library, Heidelberglaan 3.
