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arXiv 1606.01129math.DGhep-thmath-phmath.MP
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关于等变Chern-Weil型与行列式线

On equivariant Chern-Weil forms and determinant lines

Daniel S. Freed

摘要:

在群G下的不变性的强形式表现在分类空间BG上的族中。当G是一个李群时,我们提倡BG的微分几何化身。应用于光滑主丛或向量丛上的G-等变联络,等变-->族原理将曲率和Chern-Weil形式的G-等变扩张转化为标准的非等变形式.应用这一技巧得到了G-等变Dirac算子行列式线的矩映射,从而揭示了量子场论中的一些反常公式.

英文摘要:

A strong from of invariance under a group G is manifested in a family over the classifying space BG. We advocate a differential-geometric avatar of BG when G is a Lie group. Applied to G-equivariant connections on smooth principal or vector bundles, the equivariance-->families principle converts the G-equivariant extensions of curvature and Chern-Weil forms to the standard nonequivariant versions. An application of this technique yields the moment map of the determinant line of a G-equivariant Dirac operator, which in turn sheds light on some anomaly formulas in quantum field theory.

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