Reduction of stabilizers and generalized Donaldson-Thomas invariants

Michail Savvas (UT Austin)

08-Apr-2022, 19:00-20:00 (10 months ago)

Abstract: Starting with a sufficiently nice Artin stack, we explain a canonical blowup procedure that produces a Deligne-Mumford stack, resolving the locus of points with infinite automorphism group. This construction can be applied to moduli stacks parametrizing semistable sheaves or complexes on Calabi-Yau threefolds. We show that their stabilizer reductions admit natural virtual fundamental cycles, allowing us to define generalized Donaldson-Thomas invariants which act as counts of these objects. Everything in this talk is (maybe not so) secretly expected to be the shadow of a corresponding phenomenon in derived algebraic geometry, giving a new, derived perspective on Donaldson-Thomas invariants.

Based on joint work with Young-Hoon Kiem and Jun Li and joint work in progress with Jeroen Hekking and David Rydh.

algebraic geometry

Audience: researchers in the topic

( slides | video )

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Stanford algebraic geometry seminar

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