Khovanov module and the detection of unlinks
Abstract
We study a module structure on Khovanov homology, which we show is natural under the Ozsvath-Szabo spectral sequence to the Floer homology of the branched double cover. As an application, we show that this module structure detects trivial links. A key ingredient of our proof is that the H1/Torsion module structure on Heegaard Floer homology detects S1xS2 connected summands.
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