2/23/2002 Joint Harvard-CUHK-YMSC Differential Geometry Seminar

Speaker: Tom Bridgeland (University of Sheffield)

Title: Donaldson-Thomas invariants and hyperkahler manifolds: the example of theories of class S[A1]

Abstract: I will report on a project which aims to encode the DT invariants of a CY3 triangulated category in a geometric structure on its stability space. I will focus on a class of categories whose stability spaces were studied in previous joint work with Ivan Smith, and which correspond in physics to theories of class S[A1]. I will describe the resulting geometric structures using a kind of complexified Hitchin system parameterising bundles on curves equipped with pencils of flat connections.

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