arXivDaily arXiv每日学术速递 周一至周五更新
arXiv math/0408049math.SGmath.GT
收藏

开三维流形上的切触结构

Contact structures on open 3-manifolds

James Tripp

摘要:

本文研究了紧致3-流形内部的开3-流形V上的切触结构。为了做到这一点,我们引入适当的接触同痕不变量称为斜率在无穷远和分频数在无穷远。我们首先利用这些概念证明了T^2 x [0,\infty),T^2 x R和S^1 x R^2的几个分类定理。这个研究在T^2 x [0,\infty),T^2 x R,和S^1 x R^2上产生了无限多个紧切触结构,它们不允许预紧嵌入到同一空间上的另一个紧切触结构中。最后,我们证明了,如果V是不可约的,并有一个非零亏格的结束,那么有无数的紧切触结构的V,不是接触形态,但同位素。类似地,在V上有无数的过扭曲的切触结构,它们不是接触形的,但却是同位素的。

英文摘要:

In this paper, we study contact structures on any open 3-manifold V which is the interior of a compact 3-manifold. To do this, we introduce proper contact isotopy invariants called the slope at infinity and the division number at infinity. We first prove several classification theorems for T^2 x [0, \infty), T^2 x R, and S^1 x R^2 using these concepts. This investigation yields infinitely many tight contact structures on T^2 x [0,\infty), T^2 x R, and S^1 x R^2 which admit no precompact embedding into another tight contact structure on the same space. Finally, we show that if V is irreducible and has an end of nonzero genus, then there are uncountably many tight contact structures on V that are not contactomorphic, yet are isotopic. Similarly, there are uncountably many overtwisted contact structures on V that are not contactomorphic, yet are isotopic.

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。

↑