arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1703.04656math.SG
收藏

Legendrian曲面族的生成与增广

Generating families and augmentations for Legendrian surfaces

Dan Rutherford, Michael G Sullivan

摘要:

研究了曲面$M$的$1$ -喷流空间$J^1M$中Legendrian曲面$L$的增广.我们介绍了两种类型的代数/组合结构有关的前投影$L$,我们称之为链同伦图(CHDs)和莫尔斯复杂$2$ -家庭(MC 2Fs),并表明存在的$ρ$ -分级CHD或MC 2F是等价的存在的$ρ$ -分级扩增的Legendrian接触同源DGA $\mathbb{Z}/2$。CHD是将链复形、链映射和同伦算子分配给$L$的基投影的相容多边形分解的$0$ -、$1$ -和$2$ -胞元,其中限制来自$L$的前投影。一个MC 2F由一个正式的handleslide集和链复合体的集合组成,服从基于$2$参数族中Morse复合体行为的公理。证明了如果Legendrian曲面在无穷远处有一个驯服的生成族,则它有一个$0$ -分次MC ~ 2 F,从而有一个$0$ -分次增广.此外,连续映射和单值表示的$π_1(M)$相关的增广,然后用于提供更精细的障碍,生成家庭的存在,(i)是线性的无穷大或(ii)有平凡的束域。我们在几个例子中应用我们的方法。

英文摘要:

We study augmentations of a Legendrian surface $L$ in the $1$-jet space, $J^1M$, of a surface $M$. We introduce two types of algebraic/combinatorial structures related to the front projection of $L$ that we call chain homotopy diagrams (CHDs) and Morse complex $2$-families (MC2Fs), and show that the existence of either a $ρ$-graded CHD or MC2F is equivalent to the existence of a $ρ$-graded augmentation of the Legendrian contact homology DGA to $\mathbb{Z}/2$. A CHD is an assignment of chain complexes, chain maps, and homotopy operators to the $0$-, $1$-, and $2$-cells of a compatible polygonal decomposition of the base projection of $L$ with restrictions arising from the front projection of $L$. An MC2F consists of a collection of formal handleslide sets and chain complexes, subject to axioms based on the behavior of Morse complexes in $2$-parameter families. We prove that if a Legendrian surface has a tame at infinity generating family, then it has a $0$-graded MC2F and hence a $0$-graded augmentation. In addition, continuation maps and a monodromy representation of $π_1(M)$ are associated to augmentations, and then used to provide more refined obstructions to the existence of generating families that (i) are linear at infinity or (ii) have trival bundle domain. We apply our methods in several examples.

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。

↑