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It is introduced a differentiable manifold with almost contact 3-structure which consists of an almost contact metric structure and two almost contact B-metric structures. The product of this manifold and a real line is an almost…

Differential Geometry · Mathematics 2017-11-21 Mancho Manev

We construct the first example of a 5-dimensional simply connected compact manifold that admits a K-contact structure but does not admit a semi-regular Sasakian structure. For this, we need two ingredients: (a) to construct a suitable…

Differential Geometry · Mathematics 2020-11-02 Alejandro Cañas , Vicente Muñoz , Juan Rojo , Antonio Viruel

We give an elementary topological obstruction for a manifold $M$ of dimension $2q{+}1 \geq 7$ to admit a contact open book with flexible Weinstein pages and $c_1(\pi_2(M)) = 0$: if the torsion subgroup of the $q$-th integral homology group…

Geometric Topology · Mathematics 2023-01-23 Jonathan Bowden , Diarmuid Crowley

Whether every hyperbolic 3-manifold admits a tight contact structure or not is an open question. Many hyperbolic 3-manifolds contain taut foliations and taut foliations can be perturbed to tight contact structures. The first examples of…

Geometric Topology · Mathematics 2015-04-06 Tolga Etgü

We classify tight contact structures on various surgeries on the Whitehead link, which provides the first classification result on an infinite family of hyperbolic L-spaces. We also determine which of the tight contact structures are Stein…

Geometric Topology · Mathematics 2023-11-27 Hyunki Min , Isacco Nonino

We construct open book structures on all moment-angle manifolds and describe the topology of their leaves and bindings under certain restrictions. II. We also show, using a recent deep result about contact forms due to Borman, Eliashberg…

Algebraic Topology · Mathematics 2019-07-30 Yadira Barreto , Santiago López de Medrano , Alberto Verjovsky

We classify all contact projective spaces with contact surgery number one. In particular, this implies that there exist infinitely many non-isotopic contact structures on the real projective 3-space which cannot be obtained by a single…

Geometric Topology · Mathematics 2026-02-10 Marc Kegel , Monika Yadav

Graph manifolds are a class of compact, orientable 3-manifolds introduced in 1967 by Waldhausen as a generalization of Seifert fibered 3-manifolds. From the point of view of Thurston's geometrization program, graph manifolds are exactly the…

Geometric Topology · Mathematics 2025-04-09 Sylvain Maillot

We introduce symplectic Calabi-Yau caps to obtain new obstructions to exact fillings. In particular, it implies that any exact filling of the standard unit cotangent bundle of a hyperbolic surface has vanishing first Chern class and has the…

Symplectic Geometry · Mathematics 2017-05-04 Tian-Jun Li , Cheuk Yu Mak , Kouichi Yasui

We describe a necessary and sufficient condition for a principal circle bundle over an even-dimensional manifold to carry an invariant contact structure. As a corollary it is shown that all circle bundles over a given base manifold carry an…

Symplectic Geometry · Mathematics 2014-02-26 Fan Ding , Hansjörg Geiges

We construct four-dimensional symplectic cobordisms between contact three-manifolds generalizing an example of Eliashberg. One key feature is that any handlebody decomposition of one of these cobordisms must involve three-handles. The other…

Geometric Topology · Mathematics 2009-03-02 David T Gay

We determine the closed, oriented Seifert fibered 3-manifolds which carry positive tight contact structures. Our main tool is a new non-vanishing criterion for the contact Ozsvath-Szabo invariant.

Symplectic Geometry · Mathematics 2019-12-19 Paolo Lisca , Andras I. Stipsicz

Let X be a 4-manifold with contact boundary. We prove that the monopole invariants of X introduced by Kronheimer and Mrowka vanish under the following assumptions: (i) a connected component of the boundary of X carries a metric with…

Geometric Topology · Mathematics 2014-11-11 Paolo Lisca

We adapt the Ozsv\'ath-Szab\'o full path algorithm to every star-shaped graph and establish a correspondence between negative-twisting tight contact structures on any Seifert fibred space over $S^2$, and its Heegaard Floer homology groups…

Geometric Topology · Mathematics 2026-05-04 Alberto Cavallo , Irena Matkovič

By use of a variety of techniques (most based on constructions of quasipositive knots and links, some old and others new), many smooth 3-manifolds are realized as transverse intersections of complex surfaces in complex 3-space with strictly…

Geometric Topology · Mathematics 2015-08-21 Lee Rudolph

Let S^3_r(K) be the oriented 3--manifold obtained by rational r-surgery on a knot K in S^3. Using the contact Ozsvath-Szabo invariants we prove, for a class of knots K containing all the algebraic knots, that S^3_r(K) carries positive,…

Symplectic Geometry · Mathematics 2014-11-11 Paolo Lisca , Andras I Stipsicz

We introduce the classes of holomorphic $p$-contact manifolds and holomorphic $s$-symplectic manifolds that generalise the classical holomorphic contact and holomorphic symplectic structures. After observing their basic properties and…

Differential Geometry · Mathematics 2025-11-18 Hisashi Kasuya , Dan Popovici , Luis Ugarte

Using $S^1$-equivariant symplectic homology, in particular its mean Euler characteristic, of the natural filling of links of Brieskorn-Pham polynomials, we prove the existence of infinitely many inequivalent contact structures on various…

Differential Geometry · Mathematics 2016-12-21 Charles P. Boyer , Leonardo Macarini , Otto van Koert

Let (M, g) be a pseudo Riemannian manifold. We consider four geometric structures on M compatible with g: two almost complex and two almost product structures satisfying additionally certain integrability conditions. For instance, if r is a…

Differential Geometry · Mathematics 2015-11-19 Edison Alberto Fernández-Culma , Yamile Godoy , Marcos Salvai

In this second paper of a two-part series, we prove that whenever a contact 3-manifold admits a uniform spinal open book decomposition with planar pages, its (weak, strong and/or exact) symplectic and Stein fillings can be classified up to…

Symplectic Geometry · Mathematics 2026-04-06 Samuel Lisi , Jeremy Van Horn-Morris , Chris Wendl