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arXiv 2009.05477math.GT
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尖点三维流形上的组合里奇流

Combinatorial Ricci flow on cusped 3-manifolds

Xu Xu

摘要:

尖点$3$ -流形上的组合里奇流是Chow-Luo在曲面上的组合里奇流和Luo在有边界紧致$3$ -流形上的组合里奇流的一个类似,用于求尖点$3$ -流形上的完备双曲度量.组合里奇流与Casson和Rivin的最大化角结构的体积的方案是对偶的,它通过最小化修饰双曲多面体度量的余体积来寻找尖点$3$ -流形上的完全双曲度量.组合里奇流可能产生奇点。我们克服了这个困难,通过使用罗阳的扩展扩展的潜在的奇点的流量。证明了尖点$3$ -流形上完备双曲度量的存在性等价于广义组合里奇流的收敛性,从而给出了尖点$3$ -流形上完备双曲度量存在性的一个新的刻画,与Casson和Rivin的程序对偶.推广的组合里奇流也为求尖点$3$ -流形上的完备双曲度量提供了一个有效的算法。

英文摘要:

Combinatorial Ricci flow on a cusped $3$-manifold is an analogue of Chow-Luo's combinatorial Ricci flow on surfaces and Luo's combinatorial Ricci flow on compact $3$-manifolds with boundary for finding complete hyperbolic metrics on cusped $3$-manifolds. Dual to Casson and Rivin's program of maximizing the volume of angle structures, combinatorial Ricci flow finds the complete hyperbolic metric on a cusped $3$-manifold by minimizing the co-volume of decorated hyperbolic polyhedral metrics. The combinatorial Ricci flow may develop singularities. We overcome this difficulty by extending the flow through the potential singularities using Luo-Yang's extension. It is shown that the existence of a complete hyperbolic metric on a cusped $3$-manifold is equivalent to the convergence of the extended combinatorial Ricci flow, which gives a new characterization of existence of a complete hyperbolic metric on a cusped $3$-manifold dual to Casson and Rivin's program. The extended combinatorial Ricci flow also provides an effective algorithm for finding complete hyperbolic metrics on cusped $3$-manifolds.

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