A note on sign conventions in link Floer homology

TL;DR

This paper extends the multi-graded link Floer homology over Z to all 2^{l-1} possible sign assignments, clarifying the relationship between sign conventions and homology theories for links in S^3.

Contribution

It introduces a method to define 2^{l-1} Z-valued link Floer homologies from grid diagrams, connecting sign assignments with existing homology theories.

Findings

Established correspondence between sign refinements and homology over Z.

Constructed 2^{l-1} sign assignments for links.

Linked grid diagram chain complexes to multi-graded homology theories.

Abstract

For knots in S^3, the bi-graded hat version of knot Floer homology is defined over Z; however, for a link L in S^3 with #|L|=l>1, there are 2^{l-1} bi-graded hat versions of link Floer homology defined over Z, the multi-graded hat version of link Floer homology is only defined over F_2 from holomorphic considerations, and there is a multi-graded version of link Floer homology defined over Z using grid diagrams. In this short note, we try to address this issue, by extending the F_2-valued multi-graded link Floer homology theory to 2^{l-1} Z-valued theories. A grid diagram representing a link gives rise to a chain complex over F_2, whose homology is related to the multi-graded hat version of link Floer homology of that link over F_2. A sign refinement of the chain complex exists, and for knots, we establish that the sign refinement does indeed correspond to the sign assignment for the hat version of the knot Floer homology. For links, we create 2^{l-1} sign assignments on the grid diagrams, and show that they are related to the 2^{l-1} multi-graded hat versions of link Floer homology over Z, and one of them corresponds to the existing sign refinement of the grid chain complex.