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Duncan McCoy

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Email: mc_coy dot duncan at uqam dot caOffice: PK-5320
Postal address:Département de mathématiques,Université du Québec à Montréal,PO Box 8888, centre-ville,Montréal H3C 3P8,Québec, Canada

Duncan McCoy

I am an assistant professor of mathematics at l'Université du Québec à Montréal, where I hold a Canada Research Chair in low-dimensional topology. My research is concentrated on 3-manifolds, 4-manifolds and their applications to knot theory.

Previously, I was a Bing Postdoctoral Fellow at the University of Texas at Austin and I completed my PhD at the University of Glasgow in 2016. You can explore my full mathematical lineage here. My thesis is available from the arXiv and the University of Glasgow's repository.

You may also appreciate some unreasonably amusing number theory.

Preprints:

  • Special alternating links of minimal unlinking number
    - with JungHwan Park - arXiv 

  • Cusp cross-section phenomena for arithmetic hyperbolic manifolds
    -with Connor Sell - arXiv 

  • On 3-manifolds admitting co-orientable taut foliations, but none with vanishing Euler class
    - with Steve Boyer, Cameron Gordon & Ying Hu - arXiv

  • Cusp types of arithmetic hyperbolic manifolds
    -with Connor Sell - arXiv 

  • The search for alternating surgeries
    - with Ken Baker & Marc Kegel  - arXiv 

  • Quasi-alternating surgeries
    - with Ken Baker & Marc Kegel  - accepted Exp. Math. - arXiv  

  • A survey on embeddings of 3-manifolds in definite 4-manifolds
    - with Paolo Aceto & JungHwan Park - accepted Proceedings of MSJ-KMS Joint Meeting 2023 - arXiv 

Publications:

  1. Definite fillings of lens spaces
    - with Paolo Aceto & JungHwan Park  - J. Differential Geom. 131(1): 1-41 (2025) - arXiv 

  2. Two curious strongly invertible L-space knots  
    - with Ken Baker & Marc Kegel  - Adv. Math. 403 (2025), 110287- arXiv

  3. Non-integer characterizing slopes and knot Floer homology
    - Int. Math. Res. Not. IMRN 2025-5, rnaf043, (2025) - arXiv  

  4. Doubly slice Montesinos links
    - with Clayton McDonald - Michigan Math. J. 74 (1), (2024),  85-117 - arXiv 

  5. Characterizing slopes for the (-2,3,7)-pretzel knot 

-Canad. Math. Bull. 66-3 (2023), 937-950 - arXiv 

  1. The realization problem for non-integer Seifert fibered surgeries
    - with Ahmad Issa - Algebr. Geom. Topol. 23-4 (2023), 1501-1550- arXiv

  2. The Montesinos trick for proper rational tangle replacement
    - with Raphael Zentner -  Proc. Amer. Math. Soc. 151 (2023), no. 4, 1811–1822 -  arXiv

  3. Non-simply connected symplectic fillings of lens spaces
    - with Paolo Aceto & JungHwan Park - Bull. London Math. Soc. 54-3 (2022), 1010--1026 - arXiv

  4. Surgeries, sharp 4-manifolds and the Alexander polynomial
    - Algebr. Geom. Topol. 21-5 (2021), 2649--2676 - arXiv

  5. Null-homologous twisting and the algebraic genus
    - 2019–20 MATRIX annals, 147--165, Springer 2021   - arXiv

  6. Gaps between consecutive untwisting numbers
    - Glasgow. Math. J. 63 (2021), no. 1, 59-67 - arXiv

  7. Non-integer characterizing slopes for torus knots
    - Comm. Anal. Geom. 28 (2020), no. 7, 1647-1682- arXiv

  8. Smoothly embedding Seifert fibered spaces in S^4
    - with Ahmad Issa -Trans. Amer. Math. Soc. 373 (2020), no. 7, 4933–4974 - arXiv

  9. On Seifert fibered spaces bounding definite manifolds
    - with Ahmad Issa - Pacific J. Math. 304 (2020), No. 2, 463–480 - arXiv

  10. On the characterising slopes of hyperbolic knots
    - Math. Res. Let. 26 (2019), no. 5, 1517-1526 - arXiv

  11. On L-space knots obtained from unknotting arcs in alternating diagrams
    - with Andrew Donald & Faramarz Vafaee - New York J. Math. 25 (2019), 518–540 - arXiv

  12. On calculating the slice genera of 11- and 12-crossing knots
    - with Lukas Lewark - Exp. Math. 28 (2019), no. 1, 81–94 - arXiv

  13. Bounds on alternating surgery slopes
    - Algebr. Geom. Topol. 17 (2017), no. 5, 2603–2634 - arXiv

  14. Alternating knots with unknotting number one
    - Adv. Math. 305 (2017), 757–802 - arXiv

  15. On 2-bridge knots with differing smooth and topological slice genera
    - with Peter Feller - Proc. Amer. Math. Soc. 144 (2016), no. 12, 5435–5442 - arXiv

  16. Non-integer surgery and branched double covers of alternating knots
    - J. Lond. Math. Soc. (2) 92 (2015), no. 2, 311–337 - arXiv

Other things:

  1. The Small Seifert Fibred Embeddahedron
    -with Ahmad Issa - Mathematical Research Postcards - link 

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