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The Diederich-Forn{\ae}ss worm domain, an important example of a smoothly bounded pseudoconvex domain without a Stein neighborhood basis, provides key counterexamples in the theory of Several Complex Variables. In this paper, we examine its…

Complex Variables · Mathematics 2025-11-14 Fani Xerakia

A correspondence between 1) rank 2 completely integrable systems of Jacobians of algebraic curves and 2) (holomorphically) symplectic surfaces was established in a previous paper by the first author. A more general abelian variety that…

Algebraic Geometry · Mathematics 2008-11-26 J. C. Hurtubise , E. Markman

Let $V$ be a bounded domain with smooth boundary in $\R^n$, and $D^*V$ denote its disc cotangent bundle. We compute symplectic homology of $D^*V$, in terms of relative homology of loop spaces on the closure of $V$. We use this result to…

Symplectic Geometry · Mathematics 2013-06-18 Kei Irie

In this paper, we construct finite blow-up examples for symplectic mean curvature flows and we study properties of symplectic translating solitons. We prove that, the K\"ahler angle $\alpha$ of a symplectic translating soliton with $\max…

Differential Geometry · Mathematics 2008-02-08 Xiaoli Han , Jiayu Li

Lagrangian curves in 4-space entertain intriguing relationships with second order deformation of plane curves under the special affine group and null curves in a 3-dimensional Lorentzian space form. We provide a natural affine symplectic…

Symplectic Geometry · Mathematics 2013-12-24 Emilio Musso , Evelyne Hubert

We consider a $10$-dimensional family of Lehn-Lehn-Sorger-van Straten hyperk\"ahler eightfolds which have a non-symplectic automorphism of order $3$. Using the theory of finite-dimensional motives, we show that the action of this…

Algebraic Geometry · Mathematics 2021-02-15 Chiara Camere , Alberto Cattaneo , Robert Laterveer

We consider the standard Darboux space equipped with the radial symmetric contact form. We study co-orientation preserving contactomorphisms between relatively compact domains up to the boundary. We determine the contactomorphism classes…

Symplectic Geometry · Mathematics 2026-01-22 Jan Eyll , Jonas Fritsch , Kai Zehmisch

We classify non-symplectic automorphisms of odd prime order on irreducible holomorphic symplectic manifolds which are deformations of Hilbert schemes of any number n of points on K3 surfaces, extending results already known for n=2. In…

Algebraic Geometry · Mathematics 2018-02-02 Chiara Camere , Alberto Cattaneo

We determine the possible finite groups $G$ of symplectic automorphisms of hyperk\"ahler manifolds which are deformation equivalent to the second Hilbert scheme of a K3 surface. We prove that $G$ has such an action if, and only if, it is…

Algebraic Geometry · Mathematics 2025-10-13 Gerald Höhn , Geoffrey Mason

The main result asserts the existence of noncontractible periodic orbits for compactly supported time dependent Hamiltonian systems on the unit cotangent bundle of the torus or of a negatively curved manifold whenever the generating…

Symplectic Geometry · Mathematics 2007-05-23 Paul Biran , Leonid Polterovich , Dietmar Salamon

Motivated by various possible generalizations of Taubes's \(SW=Gr\) theorem [T] to Floer-theoretic setting, we prove certain variants of Taubes's convergence theorem in \cite{T} (the first part of his proof of \(SW=Gr\)). In place of the…

Geometric Topology · Mathematics 2023-01-11 Yi-Jen Lee

We prove that there exists a holomorphic symplectic manifold deformation equivalent to the Hilbert scheme of two points on a K3 surface that admits a non-symplectic automorphism of order 23, that is the maximal possible prime order in this…

Algebraic Geometry · Mathematics 2014-07-08 Samuel Boissière , Chiara Camere , Giovanni Mongardi , Alessandra Sarti

We study the cohomology of the complexes of differential, integral and pseudo forms on odd symplectic manifolds taking the wedge product with the symplectic form as differential. We show that the cohomology classes are in correspondence…

High Energy Physics - Theory · Physics 2021-04-21 R. Catenacci , C. A. Cremonini , P. A. Grassi , S. Noja

Liouville domains have become central objects in symplectic and contact geometry. However, the auxiliary data they involve --- namely, Liouville forms --- and the non-compactness of their completions generate some inconvenience. The notion…

Symplectic Geometry · Mathematics 2017-08-30 Emmanuel Giroux

As was recently pointed out by McMullen and Taubes [Math. Res. Lett. 6 (1999) 681-696], there are 4-manifolds for which the diffeomorphism group does not act transitively on the deformation classes of orientation-compatible symplectic…

Symplectic Geometry · Mathematics 2014-11-11 Claude LeBrun

We study the possibility of a continuous extension of a class of mappings to an isolated point on the boundary of a domain. We show that if some characteristic of this mapping is integrable on almost all spheres in the neighborhood of at…

Complex Variables · Mathematics 2025-11-04 Victoria Desyatka , Evgeny Sevost'yanov

In this paper we prove two isomorphisms in the local symplectic homology of a simple, which is to say non iterated, isolated Reeb orbit. The isomorphisms are in $S^1$-equivariant and nonequivariant symplectic homology, relating the local…

Symplectic Geometry · Mathematics 2020-10-06 Elijah Fender

This paper explains an application of Gromov's h-principle to prove the existence, on any orientable 4-manifold, of a folded symplectic form. That is a closed 2-form which is symplectic except on a separating hypersurface where the form…

Symplectic Geometry · Mathematics 2009-09-23 A. Cannas da Silva

We construct absolute and relative versions of Hamiltonian Floer homology algebras for strongly semi-positive compact symplectic manifolds with convex boundary, where the ring structures are given by the appropriate versions of the…

Symplectic Geometry · Mathematics 2016-05-10 Sergei Lanzat

This paper is concerned with the rational symplectic field theory in the Floer case. For this observe that in the general geometric setup for symplectic field theory the contact manifolds can be replaced by mapping tori of symplectic…

Symplectic Geometry · Mathematics 2009-01-13 Oliver Fabert