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Transverse invariants, braids, and right-veering Plamenevskaya, Olga
Description
Transverse links in $S^3$ can be described via braids. We will show that the "direction and amount of twisting" of such a braid determine, in many cases, whether the (hat-version of) Heegaard Floer transverse invariant of the corresponding link vanishes or not. In particular, we prove that for 3-braids, the Heegaard Floer transverse invariant is non-zero if and only if the braid is right-veering. For higher-order braids, a fractional Dehn twist coefficient greater than 1 implies non-vanishing of the invariant. This result parallels a well-known result of Honda-Kazez-Matic for open books: if an open book with connected binding has FDTC > 1, then the Heegaard Floer contact invariant is non-zero. Interestingly, the open books result uses taut foliations and symplectic fillings (there is no direct proof) whereas our result for braids follows from the combinatorial structure of Dehornoy's braid orderings and an examination of grid diagrams.
Item Metadata
Title |
Transverse invariants, braids, and right-veering
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Creator | |
Publisher |
Banff International Research Station for Mathematical Innovation and Discovery
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Date Issued |
2016-03-21T11:15
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Description |
Transverse links in $S^3$ can be described via braids. We will show that the "direction and amount of twisting" of such a braid determine, in many cases, whether the (hat-version of) Heegaard Floer transverse invariant of the corresponding link vanishes or not. In particular, we prove that for 3-braids, the Heegaard Floer transverse invariant is non-zero if and only if the braid is right-veering. For higher-order braids, a fractional Dehn twist coefficient greater than 1 implies non-vanishing of the invariant. This result parallels a well-known result of Honda-Kazez-Matic for open books: if an open book with connected binding has FDTC > 1, then the Heegaard Floer contact invariant is non-zero. Interestingly, the open books result uses taut foliations and symplectic fillings (there is no direct proof) whereas our result for braids follows from the combinatorial structure of Dehornoy's braid orderings and an examination of grid diagrams.
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Extent |
56 minutes
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Subject | |
Type | |
File Format |
video/mp4
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Language |
eng
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Notes |
Author affiliation: State University of New York at Stony Brook
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Series | |
Date Available |
2016-09-20
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0314352
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URI | |
Affiliation | |
Peer Review Status |
Unreviewed
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Scholarly Level |
Faculty
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International