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We introduce and study some mixed product Poisson structures on product manifolds associated to Poisson Lie groups and Lie bialgebras. For quasitriangular Lie bialgebras, our construction is equivalent to that of fusion products of…

Differential Geometry · Mathematics 2016-01-12 Jiang-Hua Lu , Victor Mouquin

Mixed 3-structures are odd-dimensional analogues of paraquaternionic structures. They appear naturally on lightlike hypersurfaces of almost paraquaternionic hermitian manifolds. We study invariant and anti-invariant submanifolds in a…

Differential Geometry · Mathematics 2020-07-30 Stere Ianus , Liviu Ornea , Gabriel Eduard Vilcu

The aim of this paper is to find all algebraic threefolds admitting quasi-regular Poisson structure. There are three types of such varieties: abelian varieties, smooth flat conic bundles over abelian surfaces and quotients of the product of…

Algebraic Geometry · Mathematics 2007-05-23 Druel Stephane

Several types of generically-nondegenerate Poisson structures can be effectively studied as symplectic structures on naturally associated Lie algebroids. Relevant examples of this phenomenon include log-, elliptic, $b^k$-, scattering and…

Symplectic Geometry · Mathematics 2020-11-30 Ralph L. Klaasse

This is an expositiry article on collapsing theory in Riemannian geometry written for the Modern Encyclopedia of Mathematical Physics (MEMPhys). We focus on describing the geometric and topological structure of collapsed/non-collapsed…

Differential Geometry · Mathematics 2007-05-23 Igor Belegradek

We present Hausdorff versions for Lie Integration Theorems 1 and 2 and apply them to study Hausdorff symplectic groupoids arising from Poisson manifolds. To prepare for these results we include a discussion on Lie equivalences and propose…

Differential Geometry · Mathematics 2021-03-17 Matias del Hoyo , Daniel López Garcia

Presymplectic and Poisson reduction of cluster maps are described in terms of the "canonical" foliations of presymplectic and Poisson manifolds. This approach to reduction leads to a geometric description, in terms of foliations, of the…

Symplectic Geometry · Mathematics 2017-07-03 Inês Cruz , Helena Mena-Matos , M. Esmeralda Sousa-Dias

Short introduction to exotic differential structures on manifolds is given. The possible physical context of this mathematical curiosity is discussed. The topic is very interesting although speculative.

High Energy Physics - Theory · Physics 2011-04-15 Jan Sladkowski

The relations between integrable Poisson algebras with three generators and two-dimensional manifolds are investigated. Poisson algebraic maps are also discussed.

High Energy Physics - Theory · Physics 2008-11-26 Sergio Albeverio , Shao-Ming Fei

In this survey, we give an introduction to nearly K\"ahler geometry, and list some results on submanifolds of these spaces. This survey tries by no means to be complete.

Differential Geometry · Mathematics 2024-01-11 Mateo Anarella

Due to its length and several inaccuracies, this article is no longer suggested for reading. Moreover, in the meantime certain results presented herein could be improved by the author in a non-trivial fashion. Instead, the reader is…

Differential Geometry · Mathematics 2009-06-13 Tillmann Jentsch

We introduce the modular class of a Poisson map. We look at several examples and we use the modular classes of Poisson maps to study the behavior of the modular class of a Poisson manifold under different kinds of reduction. We also discuss…

Differential Geometry · Mathematics 2012-08-06 Raquel Caseiro , Rui Loja Fernandes

Classical limits of quantum groups give rise to multiplicative Poisson structures such as Poisson-Lie and quasi-Poisson structures. We relate them to the notion of a shifted Poisson structure which gives a conceptual framework for…

Algebraic Geometry · Mathematics 2018-06-19 Pavel Safronov

This paper can be considered as an extension to our paper [On symplectically harmonic forms on six-dimensional nilmanifolds, Comment. Math. Helv. 76 (2001), n 1, 89-109]. Also, it contains a brief survey of recent results on symplectically…

Symplectic Geometry · Mathematics 2007-05-23 R. Ibáñez , Yu. Rudyak , A. Tralle , L. Ugarte

The purpose of this paper is to propose a version of the notion of convenient Lie groupoid as a generalization of this concept in finite dimension. The authors point out which obstructions appear in the infinite dimensional context and how…

Differential Geometry · Mathematics 2025-10-15 Fernand Pelletier , Patrick Cabau

Submanifolds of finite type were introduced by the author during the late 1970s. The first results on this subject were collected in author's books [26,29]. In 1991, a list of twelve open problems and three conjectures on finite type…

Differential Geometry · Mathematics 2014-01-17 Bang-Yen Chen

In this short note we give a complete characterization of a certain class of compact corank one Poisson manifolds, those equipped with a closed one-form defining the symplectic foliation and a closed two-form extending the symplectic form…

Symplectic Geometry · Mathematics 2015-09-09 Victor Guillemin , Eva Miranda , Ana Rita Pires

This is the first in a series of papers dedicated to the study of Poisson manifolds of compact types (PMCTs). This notion encompasses several classes of Poisson manifolds defined via properties of their symplectic integrations. In this…

Differential Geometry · Mathematics 2016-03-23 Marius Crainic , Rui Loja Fernandes , David Martinez Torres

We construct a Poisson isomorphism between the formal Poisson manifolds g^* and G^*, where g is a finite dimensional quasitriangular Lie bialgebra. Here g^* is equipped with its Lie-Poisson (or Kostant-Kirillov-Souriau) structure, and G^*…

Quantum Algebra · Mathematics 2018-09-10 B. Enriquez , P. Etingof , I. Marshall

We give a local normal form for Dirac structures. As a consequence, we show that the dimensions of the pre-symplectic leaves of a Dirac manifold have the same parity. We also show that, given a point $m$ of a Dirac manifold $M$, there is a…

Symplectic Geometry · Mathematics 2014-01-14 Jean-Paul Dufour , Aissa Wade