Link homology and equivariant gauge theory

Prayat Poudel, Nikolai Saveliev

Research output: Contribution to journalArticlepeer-review


Singular instanton Floer homology was defined by Kronheimer and Mrowka in connection with their proof that Khovanov homology is an unknot detector. We study this theory for knots and two-component links using equivariant gauge theory on their double branched covers. We show that the special generator in the singular instanton Floer homology of a knot is graded by the knot signature mod 4, thereby providing a purely topological way of fixing the absolute grading in the theory. Our approach also results in explicit computations of the generators and gradings of the singular instanton Floer chain complex for several classes of knots with simple double branched covers, such as two-bridge knots, some torus knots, and Montesinos knots, as well as for several families of two-component links.

Original languageEnglish (US)
Pages (from-to)2635-2685
Number of pages51
JournalAlgebraic and Geometric Topology
Issue number5
StatePublished - Sep 19 2017

ASJC Scopus subject areas

  • Geometry and Topology


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