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arXiv math/0703251math.SGmath.AG
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SL(3,C)- Character簇关于有边界曲面的Poisson几何

Poisson Geometry of SL(3,C)-Character Varieties Relative to a Surface with Boundary

Sean Lawton

摘要:

通过考虑带边界曲面的曲面群表示,自然地得到了自由群F的SL(3,C)-表示簇R。在R的配位环上存在SL(3,C)-共轭作用.这个作用的不变量的子环的几何点是仿射簇X。X的点参数化完全可约表示的同构类。我们证明了坐标环C[X]是一个复Poisson代数关于F的一个表示所施加的表面。最后,我们给出了当曲面为三孔球面或单孔环面时所有生成元的括号。

英文摘要:

The SL(3,C)-representation variety R of a free group F arises naturally by considering surface group representations for a surface with boundary. There is a SL(3,C)-action on the coordinate ring of R by conjugation. The geometric points of the subring of invariants of this action is an affine variety X. The points of X parametrize isomorphism classes of completely reducible representations. We show the coordinate ring C[X] is a complex Poisson algebra with respect to a presentation of F imposed by the surface. Lastly, we work out the bracket on all generators when the surface is a three-holed sphere or a one-holed torus.

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