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arXiv · 1508.02609

Non-Orientable Lagrangian Cobordisms between Legendrian Knots

Orsola Capovilla-Searle·Lisa Traynor
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Abstract

In the symplectization of standard contact $3$-space, $\mathbb R \times \mathbb R^3$, it is known that an orientable Lagrangian cobordism between a Legendrian knot and itself, also known as an orientable Lagrangian endocobordism for the Legendrian knot, must have genus $0$. We show that any Legendrian knot has a non-orientable Lagrangian endocobordism, and that the crosscap genus of such a non-orientable Lagrangian endocobordism must be a positive multiple of $4$. The more restrictive exact, non-orientable Lagrangian endocobordisms do not exist for any exactly fillable Legendrian knot but do exist for any stabilized Legendrian knot. Moreover, the relation defined by exact, non-orientable Lagrangian cobordism on the set of stabilized Legendrian knots is symmetric and defines an equivalence relation, a contrast to the non-symmetric relation defined by orientable Lagrangian cobordisms.

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Orsola Capovilla-Searle, Lisa Traynor. 2015-08-11. Non-Orientable Lagrangian Cobordisms between Legendrian Knots. https://doi.org/10.2140/pjm.2016.285.319

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