Algebraic Geometry Seminar
The algebraic geometry seminar in Term 3 2025/2026 will usually meet on Wednesdays at 3 pm, though we may sometimes change to allow speakers from other time zones.
Most talks will be either in B3.02 or MB0.07 -- see specific information below.
A link to talks from the previous term is here.
Wednesday 29 Apr 2026, 3pm. Speaker: Luca Tasin (Università degli Studi di Milano Statale)
Title: Sasaki–Einstein metrics on spheres
Abstract: The geometry of spheres has long been a source of central problems in mathematics, and Sasaki–Einstein metrics—odd-dimensional analogues of Kähler–Einstein metrics—offer a particularly rich perspective. In joint work with Yuchen Liu and Taro Sano, we construct infinitely many Sasaki–Einstein metrics on odd-dimensional spheres that bound parallelizable manifolds, thereby confirming conjectures of Boyer–Galicki–Kollár and Collins–Székelyhidi. Our approach is based on establishing the K-stability of certain Fano weighted hypersurfaces.
Wednesday 6 May 2026, 3pm. Speaker:
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Wednesday 13 May 2026, 3pm. Speaker: BU Chengjing (Oxford)
Title: Semiorthogonal decompositions for stacks
Abstract: I will report on a joint work with Tudor Pădurariu and Yukinobu Toda on a construction of semiorthogonal decompositions on derived categories of coherent sheaves on algebraic stacks. This can be seen as a categorification of a decomposition theorem for cohomology of stacks obtained in an earlier joint work, which is itself a categorification of
the theory of Donaldson–Thomas invariants. I will discuss its applications to categorification of quantum groups and to the Dolbeault geometric Langlands conjecture.
Wednesday 20 May 2026, 3pm. Speaker: Benjamin Sung (University of Southern Denmark)
Wednesday 27 May 2026, 3pm. Speaker:
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Wednesday 3 Jun 2026, 3pm. Speaker: Martin de Borbon (Loughborough)
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Wednesday 10 Jun 2026, 3pm. Speaker:
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Wednesday 17 Jun 2026, 3pm. Speaker: Asher Auel (Dartmouth)
Title: TBA
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Wednesday 24 Jun 2026, 3pm. Speaker:
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Wednesday 1 Jul 2026, 3pm. Speaker:
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