Abstract
The closure of a braid in a closed orientable surface Σ is a link in Σ × S1. We classify such closed surface braids up to isotopy and homeomorphism (with a small indeterminacy for isotopy of closed sphere braids), algebraically in terms of the surface braid group. We find that in positive genus, braids close to isotopic links if and only if they are conjugate, and close to homeomorphic links if and only if they are in the same orbit of the outer action of the mapping class group on the surface braid group modulo its center.
Original language | English |
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Pages (from-to) | 297-306 |
Number of pages | 10 |
Journal | Glasgow Mathematical Journal |
Volume | 63 |
Issue number | 2 |
Early online date | 15 May 2020 |
DOIs | |
Publication status | Published - May 2021 |
Keywords
- Surface braids
- link isotopy
- link homeomorphism
- Birman exact sequence
- Dehn–Nielsen–Baer Theorem
- 57N05
- 57M27
- 2010 Mathematics Subject Classification
- 20F36