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arXiv 1111.2828math.GT
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三维流形的SL(n,C)-表示的复体积

The complex volume of SL(n,C)-representations of 3-manifolds

Stavros Garoufalidis, Dylan P. Thurston, Christian K. Zickert

摘要:

对于具有任意边界(可能为空)的紧致3-流形M,给出了M的基本群的边界幂幺表示的共轭类集在SL(n,C)中的参数化.我们的参数化使用托勒密坐标,这是由更高的Teichmueller空间由于福克和Goncharov坐标的启发。我们表明,一个边界幂幺表示确定在诺依曼的扩展布洛赫群的元素,并使用此获得一个有效的公式的Cheeger-Chern-Simons不变量,特别是体积。计算人口普查流形表明,边界幂幺表示是丰富的,和人口普查卷的数值比较,表明一个代表的体积是一个积分线性组合的双曲3-流形的体积。这与沃尔特·诺依曼的一个猜想一致,他认为布洛赫群是由双曲流形生成的。

英文摘要:

For a compact 3-manifold M with arbitrary (possibly empty) boundary, we give a parametrization of the set of conjugacy classes of boundary-unipotent representations of the fundamental group of M into SL(n,C). Our parametrization uses Ptolemy coordinates, which are inspired by coordinates on higher Teichmueller spaces due to Fock and Goncharov. We show that a boundary-unipotent representation determines an element in Neumann's extended Bloch group, and use this to obtain an efficient formula for the Cheeger-Chern-Simons invariant, and in particular for the volume. Computations for the census manifolds show that boundary-unipotent representations are abundant, and numerical comparisons with census volumes, suggest that the volume of a representation is an integral linear combination of volumes of hyperbolic 3-manifolds. This is in agreement with a conjecture of Walter Neumann, stating that the Bloch group is generated by hyperbolic manifolds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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