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arXiv 1901.08415math.SG
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单调拉格朗日环面的Bohr-Sommerfeld覆盖的Legendrian子流形

Legendrian submanifolds from Bohr-Sommerfeld covers of monotone Lagrangian tori

Georgios Dimitroglou Rizell, Roman Golovko

摘要:

根据Ziltener的一个结果,对于全空间为标准接触球的预量子化丛,在$\mathbb CP^n$中不存在封闭的嵌入Bohr-Sommerfeld拉格朗日量.另一方面,任何嵌入的单调拉格朗日环面有一个典型的非平凡覆盖,这是一个玻尔-索末菲浸入。我们绘制了二维Clifford和Chekanov环面(前者是Harvey-Lawson特殊拉格朗日锥的Legendrian链)的三重覆盖的接触达布球内相应Legendrian升力的前投影,并计算了相关的Chekanov-Eliashberg代数。虽然这些Legendrians是不宽松的,我们表明,他们都承认确切的拉格朗日配边宽松的Legendrian领域,因此,他们承认确切的拉格朗日帽的symplectisation,这是非正规的拉格朗日配边。一路上,我们还计算bilinearised Legendrian接触的同源性的一般Legendrian表面在标准的接触向量空间时,所有的Reeb弦是积极的程度,以及增强品种的情况下,环面。

英文摘要:

By a result due to Ziltener, there exist no closed embedded Bohr-Sommerfeld Lagrangians inside $\mathbb CP^n$ for the prequantisation bundle whose total space is the standard contact sphere. On the other hand, any embedded monotone Lagrangian torus has a canonical nontrivial cover which is a Bohr-Sommerfeld immersion. We draw the front projections for the corresponding Legendrian lifts inside a contact Darboux ball of the threefold covers of both the two-dimensional Clifford and Chekanov tori (the former is the Legendrian link of the Harvey-Lawson special Lagrangian cone), and compute the associated Chekanov-Eliashberg algebras. Although these Legendrians are not loose, we show that they both admit exact Lagrangian cobordisms to the loose Legendrian sphere; they hence admit exact Lagrangian caps in the symplectisation, which are non-regular Lagrangian cobordisms. Along the way, we also compute bilinearised Legendrian contact homology of a general Legendrian surface in the standard contact vector space when all Reeb chords are of positive degree, as well as the augmentation variety in the case of tori.

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