The instanton Floer homology of a knot in the three-sphere is a vector space with a canonical mod 2 grading. It carries a distinguished endomorphism of even degree, arising from the 2–dimensional homology class represented by a Seifert surface. The Floer homology decomposes as a direct sum of the generalized eigenspaces of this endomorphism. We show that the Euler characteristics of these generalized eigenspaces are the coefficients of the Alexander polynomial of the knot. Among other applications, we deduce that instanton homology detects fibered knots.
Kronheimer, Peter  1 ; Mrowka, Tomasz  2
@article{10_2140_agt_2010_10_1715,
author = {Kronheimer, Peter and Mrowka, Tomasz},
title = {Instanton {Floer} homology and the {Alexander} polynomial},
journal = {Algebraic and Geometric Topology},
pages = {1715--1738},
year = {2010},
volume = {10},
number = {3},
doi = {10.2140/agt.2010.10.1715},
url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2010.10.1715/}
}
TY - JOUR AU - Kronheimer, Peter AU - Mrowka, Tomasz TI - Instanton Floer homology and the Alexander polynomial JO - Algebraic and Geometric Topology PY - 2010 SP - 1715 EP - 1738 VL - 10 IS - 3 UR - http://geodesic.mathdoc.fr/articles/10.2140/agt.2010.10.1715/ DO - 10.2140/agt.2010.10.1715 ID - 10_2140_agt_2010_10_1715 ER -
%0 Journal Article %A Kronheimer, Peter %A Mrowka, Tomasz %T Instanton Floer homology and the Alexander polynomial %J Algebraic and Geometric Topology %D 2010 %P 1715-1738 %V 10 %N 3 %U http://geodesic.mathdoc.fr/articles/10.2140/agt.2010.10.1715/ %R 10.2140/agt.2010.10.1715 %F 10_2140_agt_2010_10_1715
Kronheimer, Peter; Mrowka, Tomasz. Instanton Floer homology and the Alexander polynomial. Algebraic and Geometric Topology, Tome 10 (2010) no. 3, pp. 1715-1738. doi: 10.2140/agt.2010.10.1715
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