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arXiv 1808.04059math.SGmath.GT
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余维$2$中流形的等切触嵌入

Iso-contact embeddings of manifolds in co-dimension $2$

Dishant M. Pancholi, Suhas Pandit

摘要:

本文研究闭切触流形的余维$2$等切触嵌入。我们首先证明了一个闭接触流形$(M^{2n-1}, ξ_M)$ iso-contact嵌入一个接触流形$(N^{2n+1}, ξ_N),$中,只要$M$ contact嵌入$(N, ξ_N)$中具有平凡法丛,并且通过这个嵌入在$M$上诱导的切触结构作为几乎切触结构是同伦的到$ξ_M.$。我们应用这个结果首先建立了一个闭接触$3$ --没有$2$ --其第二整上同调等接触中的挠嵌入标准接触$5$ -球面当且仅当切触结构的第一Chern类为零。最后讨论了闭单连通切触$5$ -流形的等切触嵌入。

英文摘要:

The purpose of this article is to study co-dimension $2$ iso-contact embeddings of closed contact manifolds. We first show that a closed contact manifold $(M^{2n-1}, ξ_M)$ iso-contact embeds in a contact manifold $(N^{2n+1}, ξ_N),$ provided $M$ contact embeds in $(N, ξ_N)$ with a trivial normal bundle and the contact structure induced on $M$ via this embedding is homotopic as an almost-contact structure to $ξ_M.$ We apply this result to first establish that a closed contact $3$--manifold having no $2$--torsion in its second integral cohomology iso-contact embeds in the standard contact $5$--sphere if and only if the first Chern class of the contact structure is zero. Finally, we discuss iso-contact embeddings of closed simply connected contact $5$--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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