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Duality and finiteness for equivariant vector bundles on Drinfeld spaces

  • Speaker: Zhixiang Wu(University of Science and Technology of China)

  • Time: Oct 21, 2026, 16:00-17:00

  • Location: M1001, College of Science Building

Abstract
We study duality and finiteness for locally analytic representations arising from compactly supported coherent cohomology of Drinfeld spaces. We show that Grothendieck--Serre duality for equivariant vector bundles realizes Bernstein--Zelevinsky duality of locally analytic representations. Following Fargues' strategy for $\ell$-adic sheaves, we obtain explicit resolutions of these representations by compactly induced representations. The resolutions imply that the cohomology is of compact presentation, a notion that generalizes finite presentation. As an application, we deduce finiteness and duality for extension groups of supercuspidal locally analytic representations of $\mathrm{GL}_2(\mathbb{Q}_p)$.
This is joint work with Zhenghui Li and Benchao Su.