A classification result and contact structures in oriented cyclic orbifold

TL;DR

This paper proves that every oriented compact cyclic 3-orbifold admits a contact structure, introduces concepts like overtwisted and tight contact structures on such orbifolds, and classifies these orbifolds with new results.

Contribution

It provides an independent proof of contact structures on cyclic 3-orbifolds, introduces new definitions, and classifies these orbifolds with novel results.

Findings

Every cyclic 3-orbifold has a contact structure.

Contact structures can be homotoped to overtwisted structures intersecting the singular locus.

A new classification of compact oriented cyclic 3-orbifolds is established.

Abstract

We prove every oriented compact cyclic $3$-orbifold has a contact structure. There is another proof in the web by Daniel Herr in his uploaded thesis which depends on open book decompositions, ours is independent of that. We define overtwisted contact structures, tight contact structures and Lutz twist on oriented compact cyclic 3-orbifolds. We show every contact structure in an oriented compact cyclic $3$-orbifold contactified by our method is homotopic to an overtwisted structure with the overtwisted disc intersecting the singular locus of the orbifold. We pose Eliashberg's like characterization of overtwisted contact structures of cyclic $3$-orbifolds as an open problem. In course of proving the above results we prove a classification result for compact oriented cyclic-3 orbifolds which has not been seen by us in literature before.