Stability and triviality of the transverse invariant from Khovanov homology
Stability and triviality of the transverse invariant from Khovanov homology
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Khovanov 同调横向不变量的稳定性和平凡性
DOI:
10.1016/j.topol.2020.107146
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发表时间:
2020
影响因子:
0.6
通讯作者:
Lee, Christine Ruey
中科院分区:
文献类型:
--
作者:
Hubbard, Diana;Lee, Christine Ruey
We explore properties of braids such as their fractional Dehn twist coefficients, right-veeringness, and quasipositivity, in relation to the transverse invariant from Khovanov homology defined by Plamenevskaya for their closures, which are naturally transverse links in the standard contact 3-sphere. For any 3-braidβ, we show that the transverse invariant of its closure does not vanish whenever the fractional Dehn twist coefficient ofβis strictly greater than one. We show that Plamenevskaya's transverse invariant is stable under adding full twists onnor fewer strands to anyn-braid, and use this to detect families of braids that are not quasipositive. Motivated by the question of understanding the relationship between the smooth isotopy class of a knot and its transverse isotopy class, we also exhibit an infinite family of pretzel knots for which the transverse invariant vanishes for every transverse representative, and conclude that these knots are not quasipositive.
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