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arXiv 1107.3687math.DGhep-thmath-phmath.GTmath.MPmath.SG
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丛格贝与模空间

Bundle gerbes and moduli spaces

Peter Bouwknegt, Varghese Mathai, Siye Wu

摘要:

本文构造了一族自伴Dirac型算子的指标丛,改进了Segal的一个构造。在一个特殊的情况下,我们构造了一个几何丛gerbe称为caloron丛gerbe,它带有一个自然的连接和弯曲,并表明它是同构的解析构造的指标丛gerbe。我们将这些构造应用于某些与紧Riemann曲面相关的模空间,在这些模空间上构造具有连通性和弯曲性的自然丛格,其3-曲率表示Dixmier-Douady类,这些类是这些模空间的第三de Rham上同调群的生成元.

英文摘要:

In this paper, we construct the index bundle gerbe of a family of self-adjoint Dirac-type operators, refining a construction of Segal. In a special case, we construct a geometric bundle gerbe called the caloron bundle gerbe, which comes with a natural connection and curving, and show that it is isomorphic to the analytically constructed index bundle gerbe. We apply these constructions to certain moduli spaces associated to compact Riemann surfaces, constructing on these moduli spaces, natural bundle gerbes with connection and curving, whose 3-curvature represent Dixmier-Douady classes that are generators of the third de Rham cohomology groups of these moduli spaces.

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