Contact
I am a postdoc at the Institut de Mathématiques de Jussieu at Sorbonne Université, supported by the Swiss National Science Foundation (SNSF). My hosts are Russell Avdek and Vincent Humilière.
Before that I did my PhD under the supervision of Felix Schlenk at the Université de Neuchâtel.
- Email:
- Johannes dot Hauber at unine dot ch
- Address:
- Institut de Mathématiques de Jussieu - Paris Rive Gauche (IMJ-PRG)
Sorbonne Université, Bureau 15-25-501
4 place Jussieu, 75005 Paris, France
Research
I work in symplectic topology, with a particular interest in symplectic embedding problems, rational homology balls, and singular Lagrangian submanifolds and their skeleta. I am interested in both quantitative questions, such as symplectic capacities and embedding obstructions, and qualitative questions concerning the rigidity and classification of Lagrangian submanifolds.
Currently I'm thinking a lot about Katok ellipsoids and Vianna tori.
Articles
- The Gromov width of Katok ellipsoids
- (in preparation)
- with Vinicius G. B. Ramos and Felix Schlenk
- Lagrangian knotting and the symplectic topology of Lagrangian complements
- (in preparation)
- with Nikolas Adaloglou
- Quantitative symplectic topology of Katok's examples and equivariant symplectic embeddings
- arXiv:2609.35209
- with Nikolas Adaloglou
- The nearby Lagrangian conjecture for pinwheels
- arXiv:2605.22473
- with Nikolas Adaloglou and Gerard Bargalló i Gómez
- Markov staircases
- arXiv:2509.03224
- with Nikolas Adaloglou, Joé Brendel, Jonny Evans and Felix Schlenk
- Pinwheels in symplectic rational and ruled surfaces and non-squeezing of rational homology balls
- with Nikolas Adaloglou, arXiv: arXiv:2503.16250;
- Journal of Topology (2026) 19 (3).
- Semi-Local Exotic Lagrangian Tori in Dimension Four
- with Joé Brendel and Joel Schmitz, arXiv:2403.00408;
- Annales de l’institut Fourier (online).
Talks
Upcoming Talks
- Symplectix seminar (Paris, 02.10.2026)
- "Quantitative symplectic topology of Katok's examples"
- IMPA (Rio de Janeiro, 25.01.2027–04.02.2027)
- Minicourse on smoothings of cyclic quotient singularities and their symplectic topology (with Nikolas Adaloglou)
Past Talks
- Unine symplectic working group (Neuchâtel, 22.09.2026)
- "Can the superpotential of a torus detect a degeneration in its complement?"
- AGNT seminar (Leiden, 17.11.2024)
- "Local exotic tori in four dimensional symplectic manifolds"
- Symplectic geometry seminar (Berlin, 07.07.2025)
- "Symplectic staircases, old and new"
- Plane curves and symplectic geometry (Les Marécottes, 21.09.2025)
- "Uniqueness of pin-ellipsoid embeddings in CP2"
- Oberseminar dynamical systems (Bochum, 25.11.2025)
- "Embedding questions of rational homology balls"
- Séminaire de topologie, géométrie et algèbre (Nantes, 11.12.2025)
- "The symplectic topology of rational homology balls"