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arXiv 0908.2796math.GTmath.QA
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单孔圆环面的积分TQFT

Integral TQFT for a one-holed torus

Patrick M. Gilmer, Gregor Masbaum

摘要:

本文给出了由积分TQFT产生的亏格为一的具有一个边界分支的曲面的映射类群的表示的新的显式公式。我们的公式允许一个计算的H-adic扩展的TQFT矩阵相关联的映射类在一个简单的方式。截断h-adic展开给出了表示的近似表示为有限群。作为一种特殊情况,我们研究了有限域上的诱导表示,并将它们等价地标识为同构。本文的关键技术成分是积分TQFT模的新的基,这些基关于Hopf对是正交的。我们构造了任意亏格上的这些正交基,并简要地描述了它们的一些其它应用。

英文摘要:

We give new explicit formulas for the representations of the mapping class group of a genus one surface with one boundary component which arise from Integral TQFT. Our formulas allow one to compute the h-adic expansion of the TQFT-matrix associated to a mapping class in a straightforward way. Truncating the h-adic expansion gives an approximation of the representation by representations into finite groups. As a special case, we study the induced representations over finite fields and identify them up to isomorphism. The key technical ingredient of the paper are new bases of the Integral TQFT modules which are orthogonal with respect to the Hopf pairing. We construct these orthogonal bases in arbitrary genus, and briefly describe some other applications of them.

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