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arXiv 1210.7367math.SGmath.GT
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双线性Legendrian接触同调与增广范畴

Bilinearised Legendrian contact homology and the augmentation category

Frédéric Bourgeois, Baptiste Chantraine

摘要:

本文构造了一个与jet空间的Legendrian子流形相关联的$\mathcal{A}_\infty$ -范畴。范畴的对象是Chekanov代数$\mathcal{A}(Λ)$的增广,态射空间的同调形成了一组新的勒让德子流形的不变量,称为双线性勒让德接触同调。这些都是作为线性勒让德接触的同源性使用两个增广,而不是一个的概括。考虑具有更多增广的相似构造,得到了范畴中的高阶合成映射,推广了[6]中的思想,其中$\mathcal{A}_\infty$ -代数是由一个增广构造的.当系数环是一个域而不考虑其特征时,这个范畴允许我们定义一个增广等价的概念。我们用简单的例子表明,双线性上同调群是有效的区分这些等价类。我们还推广了[12]中的对偶正合列,并用拉格朗日填充的弗洛尔同调对双线性同调作了几何解释(见[8])。

英文摘要:

In this paper we construct an $\mathcal{A}_\infty$-category associated to a Legendrian submanifold of jet spaces. Objects of the category are augmentations of the Chekanov algebra $\mathcal{A}(Λ)$ and the homology of the morphism spaces forms a new set of invariants of Legendrian submanifolds called the bilinearised Legendrian contact homology. Those are constructed as a generalisation of linearised Legendrian contact homology using two augmentations instead of one. Considering similar constructions with more augmentations leads to the higher order compositions map in the category and generalises the idea of [6] where an $\mathcal{A}_\infty$-algebra was constructed from one augmentation. This category allows us to define a notion of equivalence of augmentations when the coefficient ring is a field regardless of its characteristic. We use simple examples to show that bilinearised cohomology groups are efficient to distinguish those equivalences classes. We also generalise the duality exact sequence from [12] in our contest, and interpret geometrically the bilinearised homology in terms of the Floer homology of Lagrangian fillings (following [8]).

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