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Department of Mathematics,
University of California San Diego


Algebraic Geometry Seminar

Weite Pi


Moduli of one-dimensional sheaves on P^2: cohomology, perversity, and BPS invariants


The moduli spaces of one-dimensional sheaves on P^2, first studied by Simpson and Le Potier, admit a Hilbert-Chow morphism to a projective base that behaves like a completely integrable system. Following a proposal of Maulik-Toda, one expects to obtain certain BPS invariants from the perverse filtration on cohomology induced by this morphism. This motivates us to study the cohomology ring structure of these moduli spaces. In this talk, we present a minimal set of tautological generators for the cohomology ring, and propose a “Perverse = Chern” conjecture concerning these generators, which specializes to an asymptotic product formula for refined BPS invariants of local P^2. This can be viewed as an analogue of the recently proved P=W conjecture for Hitchin systems. Based on joint work with Junliang Shen, and with Yakov Kononov and Junliang Shen.

Hosts: Dragos Oprea

January 27, 2023

4:00 PM

Via Zoom: Meeting ID: 976 5385 7369