Spaces of tight contact structures in dimension 3

Abstract

We study spaces of tight contact structures and contactomorphism groups in dimension $3$. We introduce a microfibration method for studying spaces of convex surfaces in contact $3$-manifolds and apply it to describe spaces of convex disks and spheres in tight contact $3$-manifolds. With these ingredients in hand, we prove a parametric gluing theorem for contact handle attachments: the weak homotopy type of the space of tight contact structures is invariant under contact $0$-, $1$-, and $3$-handle attachments. Based on these new techniques, we present a substantial number of independent applications. First, we obtain explicit descriptions of the weak homotopy type of several spaces of tight contact structures. We determine the weak homotopy type of the contactomorphism group of every standard contact handlebody, of the standard ${\mathbb{S}}^1\times {\mathbb{S}}^2$, and of every Legendrian circle bundle with non-empty boundary, partially resolving a conjecture of Giroux. Additionally, we compute the weak homotopy type of an infinite family of spaces of Legendrian and transverse unknots, proving Legendrian and transverse analogues of Hatcher's theorem for smooth unknots in the $3$-sphere.

arXiv commentV3: Title and abstract changed. The exposition has been streamlined. The contents are essentially unchanged, except for the addition of Theorem 1.3.1, which could already be deduced from the results in previous versions

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Cited by in corpus (2)

• The space of tight contact structures on ${\mathbb{R}}^3$ is contractible
• A monopole invariant for families of contact structures