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arXiv 2109.08952math.GTmath.DGmath.RTmath.SP
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实辛群中的签名、Toledo不变量和曲面群表示

Signature, Toledo invariant and surface group representations in the real symplectic group

Inkang Kim, Pierre Pansu, Xueyuan Wan

摘要:

利用Atiyah-Patodi-Singer指标定理,得到了有边界曲面上平坦辛向量丛的签名公式,它与实辛群中曲面群表示的Toledo不变量和边界上的Rho不变量有关.作为应用,我们得到了签名的Milnor-Wood型不等式.特别地,我们给出了关于闭曲面的Toledo不变量的Milnor-Wood不等式的一个新的证明,并得到了关于带边界曲面的一些修正的不等式.

英文摘要:

In this paper, by using Atiyah-Patodi-Singer index theorem, we obtain a formula for the signature of a flat symplectic vector bundle over a surface with boundary, which is related to the Toledo invariant of a surface group representation in the real symplectic group and the Rho invariant on the boundary. As an application, we obtain a Milnor-Wood type inequality for the signature. In particular, we give a new proof of the Milnor-Wood inequality for the Toledo invariant in the case of closed surfaces and obtain some modified inequalities for the surface with boundary.

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