Abstract
We show that there exists an infinite family of pairwise non-isotopic Legendrian knots in the standard contact 3-sphere whose Stein traces are equivalent. This is the first example of such phenomenon. Different constructions are developed in the article, including a contact annulus twist, explicit Weinstein handlebody equivalences, and a discussion on dualizable patterns in the contact setting. These constructions can be used to systematically construct distinct Legendrian knots in the standard contact 3-sphere with contactomorphic \((-1)\)-surgeries and, in many cases, equivalent Stein traces. In addition, we also discuss characterizing slopes and provide results in the opposite direction, i.e. describe cases in which the Stein trace, or the contactomorphism type of an r-surgery, uniquely determines the Legendrian isotopy type.
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Notes
The n-trace of a knot K in \( S^3\) is the smooth 4-manifold obtained as the result of attaching a 2-handle to the 3-sphere boundary of the 4-ball along the knot K with framing n.
We denote the natural numbers including zero by \({\mathbb {N}}_0\) and the natural numbers without zero by \({\mathbb {N}}\).
For reference, we note that L(r) consists of a unique contact manifold if and only if \(r=1/n\) for some integer n. So our notation for \(L(\pm 1)\) agrees with the notation above. If \(n>1\) is an integer, then L(n) consists of two contact manifolds, and if n is a negative integer, then L(n) consists of |n| contact manifolds, which are not always different.
We observe that the question which contact surgery coefficients are characterizing differs from the topological question since we have always infinitely many Legendrian realizations of a single topological knot type and the framings are measured with respect to the contact framing.
Here our notion of connected sum is an internal one happening in the surgered manifold. We will explain this in detail in the proof and also argue why J represents a standard Legendrian unknot in \(L(\pm 1/n)\) and thus the connected sum is well-defined.
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Acknowledgements
We would like to thank Bob Gompf, Oleg Lazarev, and Lisa Piccirillo for helpful comments on an earlier draft of this paper. We also thank the anonymous referee for many helpful comments and suggestions that have improved the paper. Roger Casals is supported by the NSF CAREER Award DMS-1942363 and the Alfred P. Sloan Foundation. He is also thankful to John Etnyre and the Georgia Institute of Technology for their hospitality during his May 2019 visit, where we first started to discuss this project. John Etnyre thanks Lisa Piccirillo for very helpful conversations about the annulus twist and a beautiful set of lectures at the 2021 Tech Topology Summer School that informed our understanding of some of the constructions in Sect. 3.5. John Etnyre was partially supported by NSF grant DMS-1906414 and DMS-2203312. Marc Kegel would like to thank the Mathematisches Forschungsinstitut Oberwolfach where large parts of this project were carried out as a Oberwolfach Research Fellow in August 2020.
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Casals, R., Etnyre, J. & Kegel, M. Stein traces and characterizing slopes. Math. Ann. (2023). https://doi.org/10.1007/s00208-023-02662-2
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DOI: https://doi.org/10.1007/s00208-023-02662-2