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arXiv 0904.2690math.GT
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不结的Legendrian链的族不变量生成

Generating family invariants for Legendrian links of unknots

Jill Jordan, Lisa Traynor

摘要:

理论发展到无穷远线性二次生成族的勒让德结在R^3。证明了最大Thurston-Bennequin不变量为-1的非纽结具有唯一的在无穷远线性二次生成族,直到纤维保持的同构和稳定.在此基础上,构造了2-分量Legendrian链路的不变生成族多项式,其中每个分量都是极大不结。技术的发展来计算这些多项式,并计算两个家庭的Legendrian链接:合理的链接和扭曲的链接。多项式允许一个显示,一些拓扑等价的链接相同的经典不变量是不Legendrian等价。它还表明,对于这些家庭的链接的生成家庭多项式同意所产生的线性化的微分分次代数的链接。

英文摘要:

Theory is developed for linear-quadratic at infinity generating families for Legendrian knots in R^3. It is shown that the unknot with maximal Thurston--Bennequin invariant of -1 has a unique linear-quadratic at infinity generating family, up to fiber-preserving diffeomorphism and stabilization. From this, invariant generating family polynomials are constructed for 2-component Legendrian links where each component is a maximal unknot. Techniques are developed to compute these polynomials, and computations are done for two families of Legendrian links: rational links and twist links. The polynomials allow one to show that some topologically equivalent links with the same classical invariants are not Legendrian equivalent. It is also shown that for these families of links the generating family polynomials agree with the polynomials arising from a linearization of the differential graded algebra associated to the links.

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