Geometry at the ULB

differential geometry at the Université libre de Bruxelles

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Ben Sibley

I am an FNRS postdoctoral researcher at the Université Libre de Bruxelles working in gauge theory and complex geometry. Specifically, I study moduli spaces of Hermitian-Yang-Mills connections and different geometric flows on Kähler and projective manifolds.  I am particularly interested in the phenomenon of singularity formation of different geometric objects in this setting. For moduli spaces this means understanding what happens at the boundary, and for flows it usually means understanding the asymptotics in a precise way. This often involves algebraic geometry, and several complex variables. In particular, my work employs different aspects of the theory of coherent sheaves in a fundamental and extensive fashion.

Here is a list of my publications:

  • “Long-time existence for Calabi flow on ruled manifolds over Riemann surfaces” (preprint 115 pages).
  • “Complex algebraic compactifications of Hermitian-Yang-Mills moduli space” (with Daniel Greb, Matei Toma, and Richard Wentworth), Geometry & Topology 25 (2021), no. 4, 1719-1818. MR 4286363, (see also arXiv:1810.00025).
  • “Continuity of the Yang-Mills flow on the set of semistable bundles” (with Richard Wentworth), Pure and Applied Mathematics Quarterly, 17 (2021), No. 3, pp. 909-931 (see also arXiv:1904.02312).
  • “Analytic cycles, Bott-Chern forms, and singular sets for the Yang-Mills flow on Kähler manifolds” (with Richard Wentworth), Advances in Mathematics, 279 (2015), 501-531. See also arXiv:1402.3808.
  • “Asymptotics of the Yang-Mills flow for holomorphic vector bundles over Kähler manifolds: the canonical structure of the limit”, Journal für die reine und angewandte Mathematik (Crelle’s Journal), Volume 2015, Issue 706, Pages 123-191. See also arXiv:1206.5491v4.

Work in progress

  • “Glueing holomorphic bundles on Calabi-Yau threefolds” (working title, joint with Aleksander Doan and Yuuji Tanaka)

Here is a copy of my CV.

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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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