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In this note we discuss symplectic lifts of actions for a complete Lagrangian fibration. Firstly, we describe the symplectic cotangent lifts of a G-action on a manifold Q in terms of 1-cocycles in the cohomology of G induced by the action…

Symplectic Geometry · Mathematics 2018-10-16 Juan Carlos Marrero , Edith Padrón

We give a necessary and sufficient condition for lagrangians in a symplectic vector bundle to be deformed stably into transversal lagrangians. In the case of three lagrangians, we show that the associated Grothendieck group can be…

Differential Geometry · Mathematics 2007-05-23 Max Karoubi , Maria Luiza Lapa de Souza

This is a survey about the contruction of warped products between (semi-)Riemannian manifolds and metric (measure) spaces. The resulting spaces will be semi-Riemannian manifolds, metric (measure) spaces or Lorentzian metric and metric…

Differential Geometry · Mathematics 2025-03-17 Christian Ketterer

Using the microlocal theory of sheaves, we associate a category to each Weinstein manifold. By constructing a microlocal specialization functor, we show that exact Lagrangians give objects in our category, and that the category is invariant…

Symplectic Geometry · Mathematics 2023-01-03 David Nadler , Vivek Shende

We introduce new finite-dimensional cohomologies on symplectic manifolds. Each exhibits Lefschetz decomposition and contains a unique harmonic representative within each class. Associated with each cohomology is a primitive cohomology…

Symplectic Geometry · Mathematics 2012-10-02 Li-Sheng Tseng , Shing-Tung Yau

In this paper we prove first a general theorem on semiorthogonal decompositions in derived categories of coherent sheaves for flat families over a smooth base. Based on the results of math.AG/0510670, we then show that the derived…

Algebraic Geometry · Mathematics 2007-05-23 Alexander Samokhin

Let Bun_G be the moduli space of G-bundles on a smooth complex projective curve. Motivated by a study of boundary conditions in mirror symmetry, D. Gaiotto associated to any symplectic representation of G a Lagrangian subvariety of the…

Algebraic Geometry · Mathematics 2018-05-15 Victor Ginzburg , Nick Rozenblyum

In this note, we show that if $f\colon M\rightarrow X$ is a germ of a projective Lagrangian fibration from a holomorphic symplectic manifold $M$ onto a normal analytic variety $X$ with isolated quotient singularities, then $X$ is smooth. In…

Algebraic Geometry · Mathematics 2025-12-23 Niklas Müller , Zheng Xu

In this paper we show that there exist simply connected symplectic 4-manifolds which contain infinitely many knotted lagrangian tori, i.e. lagrangian embeddings of tori that are homotopic but not isotopic. Moreover, the homology class they…

Geometric Topology · Mathematics 2007-05-23 Stefano Vidussi

We suggest a general framework for compactifing quasi-projective Lagrangian fibrations of geometric origin by holomorphic symplectic varieties. This framework includes a compactification criterion, which we then apply to various fibrations…

Algebraic Geometry · Mathematics 2025-01-22 Giulia Saccà

In this paper, we provide a new construction of quiver algebroid stacks and the associated mirror functors for symplectic manifolds. First, we formulate the concept of a quiver stack, which is a geometric structure formed by gluing multiple…

Algebraic Geometry · Mathematics 2025-10-01 Siu-Cheong Lau , Junzheng Nan , Ju Tan

The fibre derivative of a bundle map is studied in detail. In the particular case of a real function, several constructions useful to study singular lagrangians are presented. Some applications are given; in particular, a geometric…

Mathematical Physics · Physics 2009-10-31 Xavier Gracia

Recently Y{\"u}ksel et. al. \cite{SY} shows that there doesn't exist any proper semi-slant warped product submanifolds in a Lorentzian paracosymplectic manifold. In the present article, we first define and give preparatory lemmas for a new…

Differential Geometry · Mathematics 2017-06-23 S. K. Srivastava , A. Sharma

We study constructions of contact forms on closed manifolds. A notion of strong symplectic fold structure is defined and we prove that there is a contact form on $M \x X$ provided that $M$ admits such a structure and $X$ is contact. This…

Symplectic Geometry · Mathematics 2013-08-13 Bogusław Hajduk , Rafał Walczak

We sketch in this article a new theory, which we call Symplectic Field Theory or SFT, which provides an approach to Gromov-Witten invariants of symplectic manifolds and their Lagrangian submanifolds in the spirit of topological field…

Symplectic Geometry · Mathematics 2007-05-23 Yakov Eliashberg , Alexander Givental , Helmut Hofer

In this brief note, we investigate graded functions of linear stacks in derived geometry. In particular, we show that under mild assumptions, we can recover a quasi-coherent sheaf on a derived stack from the data of the…

Algebraic Geometry · Mathematics 2021-10-25 Ludovic Monier

We present several results on the inverse problem and equivalent contactLagrangian systems. These problems naturally lead to consider smooth transformations on the z variable (i.e., reparametrizations of the action). We present the extended…

Mathematical Physics · Physics 2022-04-06 Manuel de León , Jordi Gaset , Manuel Lainz Valcázar

We introduce a construction of highly arc transitive digraphs using a layerwise direct product. This product generalizes some known classes of highly arc transitive digraphs but also allows to construct new such. We use the product to…

Combinatorics · Mathematics 2011-11-10 Christoph Neumann

Pluri-Lagrangian systems are variational systems with the multi-dimensional consistency property. This notion has its roots in the theory of pluriharmonic functions, in the Z-invariant models of statistical mechanics, in the theory of…

Mathematical Physics · Physics 2015-06-03 A. I. Bobenko , Yu. B. Suris

We introduce an equivalence relation for Lagrangians in a symplectic manifold known as \textit{algebraic Lagrangian cobordism}, which is meant to mirror algebraic equivalence of cycles. From this we prove a symplectic, mirror-symmetric…

Symplectic Geometry · Mathematics 2025-11-11 Alexia Corradini