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Recent work of Beben and Theriault on decomposing based loop spaces of highly connected Poincar\'e Duality complexes has yielded new methods for analysing the homotopy theory of manifolds. In this paper we will expand upon these methods,…

Algebraic Topology · Mathematics 2023-10-20 Sebastian Chenery

In this article, we study an almost contact metric structure on a $G_2$-manifold constructed by Arikan, Cho and Salur in via the classification of almost contact metric structures given by Chinea and Gonzalez. In particular, we characterize…

Differential Geometry · Mathematics 2015-01-29 Albert J. Todd

We introduce the notions of partial contact quasi-state and contact quasi-measure. Using the contact spectral invariant from the work by Djordjevi\'c-Uljarevi\'c-Zhang, one can construct partial contact quasi-states and contact…

Symplectic Geometry · Mathematics 2025-03-25 Igor Uljarević , Jun Zhang

This article sketches various ideas in contact geometry that have become useful in low-dimensional topology. Specifically we (1) outline the proof of Eliashberg and Thurston's results concerning perturbations of foliatoins into contact…

Geometric Topology · Mathematics 2007-05-23 John B. Etnyre

The aim of this paper is to give an alternative proof of a theorem about the existence of contact structures on five-manifolds due to Geiges. This theorem asserts that simply-connected five-manifolds admit a contact structure in every…

Symplectic Geometry · Mathematics 2007-06-13 Otto van Koert

In recent times a great amount of progress has been achieved in symplectic and contact geometry, leading to the development of powerful invariants of 3-manifolds such as Heegaard Floer homology and embedded contact homology. These…

Symplectic Geometry · Mathematics 2012-12-11 Daniel V. Mathews

The goal of this article is to survey recent developments in the theory of contact structures in dimension three.

Geometric Topology · Mathematics 2007-05-23 Ko Honda

Weak almost contact manifolds, i.e., the linear complex structure on the contact distribution is approximated by a nonsingular skew-symmetric tensor, defined by the author and R. Wolak (2022), allowed a new look at the theory of contact…

Differential Geometry · Mathematics 2024-05-03 Vladimir Rovenski

We give a sufficient condition in order that $n$ closed connected subsets in the $n$-dimensional real projective space admit a common multitangent hyperplane.

Algebraic Geometry · Mathematics 2026-04-24 Frédéric Mangolte , Christophe Raffalli

We develop contractive finite dimensional realizations for rational matrix functions of one variable on domains that are not simply connected, such as the annulus. The proof uses multivariable contractive realization results as well as…

Functional Analysis · Mathematics 2025-04-07 Radomił Baran , Piotr Pikul , Hugo J. Woerdeman , Michał Wojtylak

Modelled on a real hypersurface in a quaternionic manifold, we introduce a quaternionic analogue of CR structure, called quaternionic CR structure. We define the strong pseudoconvexity of this structure as well as the notion of quaternionic…

Differential Geometry · Mathematics 2013-02-18 Hiroyuki Kamada , Shin Nayatani

Generalized contact bundles are odd dimensional analogues of generalized complex manifolds. They have been introduced recently and very little is known about them. In this paper we study their local structure. Specifically, we prove a local…

Differential Geometry · Mathematics 2019-02-11 Jonas Schnitzer , Luca Vitagliano

The principle of virtual work for dissipative systems is stated. Partially controlled systems are discussed and the concept of a generating families of forms is introduced. The notion of a critical point of a family of convex forms is…

Mathematical Physics · Physics 2007-05-23 Wlodzimierz Tulczyjew , Pawel Urbanski

Cosymplectic and normal almost contact structures are analogues of symplectic and complex structures that can be defined on 3-manifolds. Their existence imposes strong topological constraints. Generalized geometry offers a natural common…

Differential Geometry · Mathematics 2026-05-21 Joan Porti , Roberto Rubio

We generalise the theories of cosymplectic, contact, and cocontact manifolds to the infinite-dimensional setting and calculate model examples of time-dependent and dissipative Hamiltonian systems.

Symplectic Geometry · Mathematics 2025-12-18 Fraser Aidan Kelvin Sanders

In this article, we investigate Reeb dynamics on $b^m$-contact manifolds, previously introduced in [MiO], which are contact away from a hypersurface $Z$ but satisfy certain transversality conditions on $Z$. The study of these contact…

Symplectic Geometry · Mathematics 2023-06-16 Eva Miranda , Cédric Oms

In this paper we generalize the main notions from the geometry of (almost) contact manifolds in the category of Lie algebroids. Also, using the framework of generalized geometry, we obtain an (almost) contact Riemannian Lie algebroid…

Differential Geometry · Mathematics 2016-11-14 Cristian Ida , Paul Popescu

A method of constructing a class of bihamiltonian structures is presented. Elements of this class are generalizations of the so-called bihamiltonian structures of general position on odd-dimensional manifolds. The method consists in a…

Differential Geometry · Mathematics 2007-05-23 Andriy Panasyuk

We exploit the Cartan-K\"ahler theory to prove the local existence of real analytic quaternionic contact structures for any prescribed values of the respective curvature functions and their covariant derivatives at a given point on a…

Differential Geometry · Mathematics 2017-11-28 Ivan Minchev , Jan Slovák

While the Hamiltonian group actions on closed symplectic manifolds have been widely explored throughout the last couple of decades, the study on Hamiltonian group actions on symplectic manifolds with a contact type boundary has started only…

Symplectic Geometry · Mathematics 2025-01-09 Aleksandra Marinkovic