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Free, publiclyaccessible full text available January 1, 2025

Suppose
is an admissible Heegaard diagram for a balanced sutured manifold$\mathcal {H}$ . We prove that the number of generators of the associated sutured Heegaard Floer complex is an upper bound on the dimension of the sutured instanton homology$(M,\gamma )$ . It follows, in particular, that strong Lspaces are instanton Lspaces.$\mathit {SHI}(M,\gamma )$ 
Sutured instanton Floer homology was introduced by Kronheimer and Mrowka. In this paper, we prove that for a taut balanced sutured manifold with vanishing second homology, the dimension of the sutured instanton Floer homology provides a bound on the minimal depth of all possible taut foliations on that balanced sutured manifold. The same argument can be adapted to the monopole and even the Heegaard Floer settings, which gives a partial answer to one of Juhasz's conjectures. Using the nature of instanton Floer homology, on knot complements, we can construct a taut foliation with bounded depth, given some information on the representation varieties of the knot fundamental groups. This indicates a mystery relation between the representation varieties and some small depth taut foliations on knot complements, and gives a partial answer to one of Kronheimer and Mrowka's conjecture.more » « less

This paper introduces tau invariants coming from the minus versions of monopole and instanton theory for knots in S3 recently defined by Li. Some basic properties are proved such as concordant invariance. The paper computes the minus versions of monopole and instanton knot Floer homologies for twist knots.more » « less

This paper constructs possible candidates for the minus versions of monopole and instanton knot Floer homologies. For a nullhomologous knot K insid Y and a base point p on K, we can associate the minus versions, KHM^{}(Y, K, p) and KHI^{}(Y, K, p), to the triple (Y, K, p). We prove that a Seifert surface of K induces a Zgrading, and there is an Umap on the minus versions, which is of degree 1. We also prove other basic properties of them. If K inside Y is not nullhomologous but represents a torsion class, then we can also construct the corresponding minus versions for (Y,K,p). We also proved a surgerytype formula relating the minus versions of a knot K with those of the dual knot, when performing a Dehn surgery of large enough slope along K. The techniques developed in this paper can also be applied to compute the sutured monopole and instanton Floer homologies of any sutured solid tori.more » « less

In this paper generalizes the work of the second author and prove a grading shifting property, in sutured monopole and instanton Floer theories, for general balanced sutured manifolds. This result has a few consequences. First, we offer an algorithm that computes the Floer homologies of a family of sutured handlebodies. Second, we obtain a canonical decomposition of sutured monopole and instanton Floer homologies and build polytopes for these two theories, which was initially achieved by Juhász for sutured (Heegaard) Floer homology. Third, we establish a Thurstonnorm detection result for monopole and instanton knot Floer homologies, which were introduced by Kronheimer and Mrowka. The same result was originally proved by Ozsváth and Szabó for link Floer homology. Last, we generalize the construction of minus versions of monopole and instanton knot Floer homology, which was initially done for knots by the second author, to the case of links. Along with the construction of polytopes, we also proved that, for a balanced sutured manifold with vanishing second homology, the rank of the sutured monopole or instanton Floer homology bounds the depth of the balanced sutured manifold. As a corollary, we obtain an independent proof that monopole and instanton knot Floer homologies, as mentioned above, both detect fibred knots in S3. This result was originally achieved by Kronheimer and Mrowka.more » « less