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PreprintCC BY-NC-SA 4.0arXiv

Cluster structures from Legendrian double twist knots: a comparative approach

  • James Hughes
  • Jiajie Ma
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Abstract

We undertake a systematic comparison of cluster algebras associated to Legendrian knots of the same smooth knot type. We describe a cluster structure on the m-graded augmentation variety of Legendrian representatives of a family of double twist knots that includes all orientably Lagrangian fillable twist knots. For different Legendrian representatives of the same smooth knot type, we show that these cluster structures are equivalent. Along the way, we characterize the representatives that admit Maslov-m exact Lagrangian fillings, construct a Catalan number of such fillings for each representative, and show that any Maslov-0 fillable representative is Legendrian isotopic to the (-1)-framed closure of a positive braid. Finally, we give two Legendrian representatives of a cabled twist knot that yield equivalent cluster structures of infinite type.

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Cite

BibTeXRIS
BibTeX
@misc{hughes2026cluster,
  title = {{Cluster structures from Legendrian double twist knots: a comparative approach}},
  author = {James Hughes and Jiajie Ma},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.02086},
  eprint = {2610.02086},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.02086},
  note = {CC BY-NC-SA 4.0},
}
RIS
TY  - UNPB
TI  - Cluster structures from Legendrian double twist knots: a comparative approach
AU  - James Hughes
AU  - Jiajie Ma
PY  - 2026
DA  - 2026/10/23
PB  - arXiv
DO  - 10.48550/arxiv.2610.02086
UR  - https://arxiv.org/abs/2610.02086
AB  - We undertake a systematic comparison of cluster algebras associated to Legendrian knots of the same smooth knot type. We describe a cluster structure on the m-graded augmentation variety of Legendrian representatives of a family of double twist knots that includes all orientably Lagrangian fillable twist knots. For different Legendrian representatives of the same smooth knot type, we show that these cluster structures are equivalent. Along the way, we characterize the representatives that admit Maslov-m exact Lagrangian fillings, construct a Catalan number of such fillings for each representative, and show that any Maslov-0 fillable representative is Legendrian isotopic to the (-1)-framed closure of a positive braid. Finally, we give two Legendrian representatives of a cabled twist knot that yield equivalent cluster structures of infinite type.
ER  -