Positive 3-braids, Khovanov homology and Garside theory
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| author | Vílchez, Álvaro Del Valle González-Meneses, Juan Silvero, Marithania |
| author_facet | Vílchez, Álvaro Del Valle González-Meneses, Juan Silvero, Marithania |
| contents | Khovanov homology is a powerful invariant of oriented links that categorifies the Jones polynomial. Nevertheless, computing Khovanov homology of a given link remains challenging in general with current techniques. In this work we focus on links that are the closure of positive 3-braids. Starting with a classification of conjugacy classes of 3-braids arising from the Garside structure of braid groups, we compute, for any closed positive 3-braid, the first four columns (homological degree) and the three lowest rows (quantum degree) of the associated Khovanov homology table. Moreover, the number of rows and columns we can describe increases with the infimum of the positive braid (a Garside theoretical notion). We will show how to increase the infimum of a 3-braid to its maximal possible value by a conjugation, maximizing the number of cells in the Khovanov homology of its closure that can be determined, and show that this can be done in linear time. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_06194 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Positive 3-braids, Khovanov homology and Garside theory Vílchez, Álvaro Del Valle González-Meneses, Juan Silvero, Marithania Geometric Topology Algebraic Topology Group Theory 57K10, 57K18, 20F36 Khovanov homology is a powerful invariant of oriented links that categorifies the Jones polynomial. Nevertheless, computing Khovanov homology of a given link remains challenging in general with current techniques. In this work we focus on links that are the closure of positive 3-braids. Starting with a classification of conjugacy classes of 3-braids arising from the Garside structure of braid groups, we compute, for any closed positive 3-braid, the first four columns (homological degree) and the three lowest rows (quantum degree) of the associated Khovanov homology table. Moreover, the number of rows and columns we can describe increases with the infimum of the positive braid (a Garside theoretical notion). We will show how to increase the infimum of a 3-braid to its maximal possible value by a conjugation, maximizing the number of cells in the Khovanov homology of its closure that can be determined, and show that this can be done in linear time. |
| title | Positive 3-braids, Khovanov homology and Garside theory |
| topic | Geometric Topology Algebraic Topology Group Theory 57K10, 57K18, 20F36 |
| url | https://arxiv.org/abs/2504.06194 |