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  4. Rotation numbers and the euler class in open books
 
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2021
Journal Article
Title

Rotation numbers and the euler class in open books

Abstract
This paper introduces techniques for computing a variety of numerical invariants associated with a Legendrian knot in a contact manifold presented by an open book with a Morse structure. Such a Legendrian knot admits a front projection to the boundary of a regular neighborhood of the binding. From this front projection, we compute the rotation number for any null-homologous Legendrian knot as a count of oriented cusps and linking or intersection numbers; in the case that the manifold has nontrivial second homology, we can recover the rotation number with respect to a Seifert surface in any homology class. We also provide explicit formulas for computing the necessary intersection numbers from the front projection, and we compute the Euler class of the contact structure supported by the open book. Finally, we introduce a notion of Lagrangian projection and compute the classical invariants of a null-homologous Legendrian knot from its projection to a fixed page.
Author(s)
Durst, S.
Kegel, M.
Licata, J.E.
Journal
Michigan mathematical journal  
Open Access
DOI
10.1307/MMJ/20195780
Language
English
Fraunhofer-Institut für Hochfrequenzphysik und Radartechnik FHR  
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