On the symmetric braid index of ribbon knots
Fuente:
arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866914079280463872 |
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| author | Brejevs, Vitalijs Kose, Feride Ceren |
| author_facet | Brejevs, Vitalijs Kose, Feride Ceren |
| contents | We define the symmetric braid index $b_s(K)$ of a ribbon knot $K$ to be the smallest index of a braid whose closure yields a symmetric union diagram of $K$, and derive a Khovanov-homological characterisation of knots with $b_s(K)$ at most three. As applications, we show that there exist knots whose symmetric braid index is strictly greater than the braid index, and deduce that every chiral slice knot with determinant one has braid index at least four. We also calculate bounds for $b_s(K)$ for prime ribbon knots with at most 11 crossings. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_14884 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | On the symmetric braid index of ribbon knots Brejevs, Vitalijs Kose, Feride Ceren Geometric Topology 57K10, 57K18 We define the symmetric braid index $b_s(K)$ of a ribbon knot $K$ to be the smallest index of a braid whose closure yields a symmetric union diagram of $K$, and derive a Khovanov-homological characterisation of knots with $b_s(K)$ at most three. As applications, we show that there exist knots whose symmetric braid index is strictly greater than the braid index, and deduce that every chiral slice knot with determinant one has braid index at least four. We also calculate bounds for $b_s(K)$ for prime ribbon knots with at most 11 crossings. |
| title | On the symmetric braid index of ribbon knots |
| topic | Geometric Topology 57K10, 57K18 |
| url | https://arxiv.org/abs/2410.14884 |