Geometry at the ULB

differential geometry at the Université libre de Bruxelles

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ULB geometry seminar

The geometry seminar is typically held every Monday in term time at 2pm, in the Salle des Profs (9th floor, building NO). We invite speakers with a broad range of expertise, from all areas of differential geometry, algebraic geometry and geometric analysis. If you would like to suggest a speaker, give a talk yourself, or want any further information about the seminar then contact any of the professors in the geometry group.

The schedule for the upcoming term is below. Click here to find the previous seminars, back to 2015.

June 2026

  • 08/06/2026 14h Salle des Profs, 9th floor building NO.
    Jun Zhang
    Title to be announced.

May 2026

  • 25/05/2026 Double bill!
    • 14h Salle des Profs, 9th floor building NO.
      Anna Roig-Sanchis (Nice).
      Title to be announced.
    • 15h15 Salle des Profs 9th floor building NO.
      Gonzalo Cao (EPFL, Laussane)
      Title to be announced.
  • 04/05/2026 14h Salle des Profs, 9th floor building NO.
    Adam Thompson (Münster)
    Title to be announced.

April 2026

  • 20/04/2026 14h Salle des Profs, 9th floor building NO.
    Alberto Abbondandolo (Bochum)
    Title to be announced.
  • 13/04/2026 14h Salle des Profs, 9th floor building NO.
    Diego Artacho de Obeso (KU Leuven)
    Stability of Einstein metrics from the spinorial viewpoint.

March 2026

  • 30/03/2026 14h Salle des Profs, 9th floor building NO.
    Andrea Bisterzo (Scuola Normale Superiore, Centro Ennio de Giorgi)
    Characterizations of embedded minimal helicoids and totally geodesic hypersurfaces in space-forms.
  • 23/03/2026 14h Salle des Profs, 9th floor building NO.
    Lorenzo Sillari (Edros Center)
    Topological and geometric aspects of almost complex 4-manifolds in the spirit of Enriques-Kodaira classification.
  • 09/03/2026 14h Salle des Profs, 9th floor building NO.
    Marco Usula (Oxford)
    Nahm poles and 0-instantons.
  • 02/03/2026 14h Salle des Profs, 9th floor building NO.
    Hartmut Weiss (Kiel)
    Transgressive harmonic maps and SU(1,1)-self-duality solutions.

February 2026

  • 23/02/2026 14h Salle des Profs, 9th floor building NO.
    Yannick Herfray (Tours)
    A new twist to twistor theory (higher spin interactions).
  • 09/02/2026 14h Salle des Profs, 9th floor building NO.
    Rodrigo Avalos (Tübingen)
    Regularity of compactified AE 3-manifolds and optimal structures of infinity.
  • 02/02/2026 14h Salle des Profs, 9th floor building NO.
    John Hughes (Oxford)
    Towards a Taub-Bolt to Taub-NUT via Ricci flow with surgery.

January 2026

  • 26/01/2026 14h Salle des Profs, 9th floor building NO.
    Qiu Shi Wang (Oxford)
    Computer-assisted construction of SU(2)-invariant cohomogeneity one Einstein metrics
  • 19/01/2026 14h Salle des Profs, 9th floor building NO.
    Kiril Krasnov (Nottingham)
    G-structures, elliptic complexes and 4D Einstein equations.

December 2025

  • 15/12/2025 14h Salle des Profs, 9th floor building NO.
    Juan Munoz-Echaniz (Stonybrook New York)
    Constraints on Lefschetz fibrations with 4-dimensional fibers.
  • 08/12/2025 14h Salle des Profs, 9th floor building NO.
    Davide Parise (Imperial College London)
    Log-epiperimetric inequalities for conformally invariant geometric variational problems.
  • 01/12/2025 14h Salle des Profs, 9th floor building NO.
    Romain Saunier (Toulouse)
    Embedded Contact Homology for monotone toric domains

November 2025

  • Note the unusual time and day!
    27/11/2025 12h30 Salle des Profs 9th floor building NO.
    Christophe Böhm (Münster)
    The cohomogeneity one Einstein ODE.
  • 24/11/2025 14h Salle des Profs, 9th floor building NO.
    Hartmut Weiss (Kiel)
    Talk postponed due to general strike
  • 10/11/2025 14h Salle des Profs, 9th floor building NO.
    Jean Gutt (ULB)
    Ekeland-Hofer capacities from positive S^1 equivariant symplectic homology.
  • 04/11/2025 14h Salle des Profs, 9th floor building NO.
    Siqi He (Chinese Academy of Sciences)
    On some properties of Z2 eigenvalues on round two sphere.

October 2025

  • 27/10/2025 14h Salle des Profs, 9th floor building NO.
    Viktor Majewski (Berlin)
    Spin(7)-Orbifold Resolutions.
  • 13/10/2025 14h Salle des Profs, 9th floor building NO.
    Jakob Stein (IMPA Rio de Janeiro)
    Nearly G2-structures and G2-Laplacian co-flows.
  • 06/10/2025 14h Salle des Profs, 9th floor building NO.
    Klaus Kröncke (Stockholm)
    On the volume-renormalized mass.

September 2025

  • 29/09/2025 14h Salle des Profs, 9th floor building NO.
    Jason Lotay (Oxford)
    The heterotic SU(3) moduli space.
  • 22/09/2025 14h Salle des Profs, 9th floor building NO.
    Spandan Ghosh (Oxford).
    Lagrangian mean curvature flow out of conical singularities.

Latest news for the geometry seminar

  • Diego Artacho de Obeso to talk in geometry seminar 13/04/2026 - Diego Artacho de Obeso (KU Leuven) will speak in the geometry seminar on 13th April, at 2pm in the Salle des Profs. Diego’s title is “Stability of Einstein metrics from the spinorial viewpoint” and his abstract is below.
  • Andrea Bisterzo to speak in geometry seminar 30/03/2026 - Andrea Bisterzo (Pisa) will speak in the geometry seminar on 30th March at 2pm. The talk will take place in the Salle des Profs (9th floor). Andrea’s title is “Characterizations of embedded minimal helicoids and totally geodesic hypersurfaces in space-forms” and his abstract is below.
  • Lorenzo Sillari to speak in geometry seminar 23/03/2026 - Lorenzo Sillari (Erdos Center) will speak in the geometry seminar at 2pm on 23rd March. The talk will take place in the Salle des Profs (9th floor building NO). Lorenzo’s title is “Topological and geometric aspects of almost complex 4-manifolds in the spirit of Enriques-Kodaira classification” and his abstract is below.
  • Marco Usula to speak in geometry seminar 09/03/2026 - Marco Usula (Oxford) will talk in the geometry seminar on 9th March, at 2pm in the Salle des Profs (9th floor building NO). Marco’s title is “Nahm poles and 0-instantons” and his abstract is below.
  • Hartmut Weiss to talk in geometry seminar 02/03/2026 - Hartmut Weiss (Kiel) will speak in the geometry seminar at 2pm on 2nd March in the Salle des Profs (9th floor, building NO). Harmut’s title is “Transgressive harmonic maps and SU(1,1)-self-duality solutions” and his abstract is below.

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Address

Département de mathématiques
Université libre de Bruxelles CP 218
Boulevard du Triomphe, Bruxelles 1050,
Belgium

Getting here

The department of mathematics is in building NO, on the Campus de la Plaine, of the Université libre de Bruxelles. The geometry group is on the 7th floor. This page has a map of the campus as well as information on how to reach it via public transport. See the STIB website for more information on public transport in Brussels.

Image credits

Polished ammonite fossil, by Kara Stenberg, Creative Commons licence CC BY-NC 2.0.

Model of 3D projection of a 120-cell, by Edmund Harriss.

The root system of the exceptional Lie algebra E8. By Jared Tarbell, Creative Commons Licence CC BY 2.0.

Getting here

The department of mathematics is in building NO, on the Campus de la Plaine, of the Université libre de Bruxelles. The geometry group is on the 7th floor. This map shows NO, as well as the metro station Delta and entrance 2, which is right by the stop for the number 71 and 72 buses. The number 95 also stops a short walk from the department. See the STIB website for more information on public transport in Brussels.

Image credits

Polished ammonite fossil, by Kara Stenberg, Creative Commons licence CC BY-NC 2.0.

Model of 3D projection of a 120-cell, by Edmund Harriss.

The root system of the exceptional Lie algebra E8. By Jared Tarbell, Creative Commons Licence CC BY 2.0.

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