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In this paper, we study multiplicity of solutions of the Yamabe problem on product manifolds with minimal boundary via bifurcation theory.

Differential Geometry · Mathematics 2015-10-20 Elkin Dario Cárdenas Diaz , Ana Cláudia da Silva Moreira

In this paper we consider traces at initial times for functions with mixed time-space smoothness. Such results are often needed in the theory of evolution equations. Our result extends and unifies many previous results. Our main improvement…

Analysis of PDEs · Mathematics 2022-05-17 Antonio Agresti , Nick Lindemulder , Mark Veraar

These notes, based on the mini-course given at the PQR2003 Euroschool held in Brussels in 2003, aim to review Kontsevich's formality theorem together with his formula for the star product on a given Poisson manifold. A brief introduction to…

Quantum Algebra · Mathematics 2020-05-29 Alberto S. Cattaneo , Davide Indelicato

These lecture notes provide a basic introduction to Selberg's trace formula. We discuss the simplest possible case: the spectrum of the Laplacian on a compact Riemannian surface of constant negative curvature. (To appear in Springer LNP.)

Spectral Theory · Mathematics 2015-09-07 Jens Marklof

In this paper, we will see that the symplectic creed by Weinstein "everything is a Lagrangian submanifold" also holds for Hamilton-Poincar\'e and Lagrange-Poincar\'e reduction. In fact, we show that solutions of the Hamilton-Poincar\'e…

Differential Geometry · Mathematics 2014-05-20 E. García-Toraño Andrés , E. Guzmán , J. C. Marrero , T. Mestdag

We prove a coisotropic intersection result and deduce the following: 1. Lower bounds on the displacement energy of a subset of a symplectic manifold, in particular a sharp stable energy-Gromov-width inequality. 2. A stable non-squeezing…

Differential Geometry · Mathematics 2012-09-04 Jan Swoboda , Fabian Ziltener

We develop a general method for extending Markov processes to a larger state space such that the added points form a polar set. The so obtained extension is an improvement on the standard trivial extension in which case the process is made…

Probability · Mathematics 2019-09-06 Lucian Beznea , Iulian Cîmpean , Michael Röckner

It is well known that a compact two dimensional surface is homeomorphic to a polygon with the edges identified in pairs. This paper not only presents a new proof of this statement but also generalizes it for any connected n-dimensional…

General Mathematics · Mathematics 2007-05-23 Sergey Nikitin

The author proved that if the circle acts symplectically on a compact, connected symplectic manifold $M$ with three fixed points, then $M$ is equivariantly symplectomorphic to some standard action on $\mathbb{CP}^2$. In this paper, we…

Differential Geometry · Mathematics 2022-01-06 Donghoon Jang

We consider the porous medium equation with a power-like reaction term, posed on Riemannian manifolds. Under certain assumptions on $p$ and $m$ in (1.1), and for small enough nonnegative initial data, we prove existence of global in time…

Analysis of PDEs · Mathematics 2020-12-07 Gabriele Grillo , Giulia Meglioli , Fabio Punzo

Given two convex polytopes, the join, the cartesian product and the direct sum of them are well understood. In this paper we extend these three kinds of products to abstract polytopes and introduce a new product, called the topological…

Combinatorics · Mathematics 2016-03-14 Ian Gleason , Isabel Hubard

We study moduli spaces of meromorphic connections (with arbitrary order poles) over Riemann surfaces together with the corresponding spaces of monodromy data (involving Stokes matrices). Natural symplectic structures are found and described…

Differential Geometry · Mathematics 2020-02-04 Philip Boalch

We consider classes T of topological spaces (referred to as T-spaces) that are stable under continuous images and frequently under arbitrary products. A local T-space has for each point a neighborhood base consisting of subsets that are…

General Topology · Mathematics 2020-10-09 Simon Brandhorst , Marcel Erné

Let $(X,\sigma,J)$ be a compact K\"{a}hler Calabi-Yau manifold equipped with a symplectic circle action. By Frankel's theorem \cite{F}, the action on $X$ is non-Hamiltonian and $X$ does not have any fixed point. In this paper, we will show…

Symplectic Geometry · Mathematics 2013-04-03 Yunhyung Cho , Min Kyu Kim

Given a star product with separation of variables $\star$ on a pseudo-K\"ahler manifold $M$ and a point $x_0 \in M$, we construct an associative algebra of formal distributions supported at $x_0$. We use this algebra to express the formal…

Quantum Algebra · Mathematics 2021-03-11 Alexander Karabegov

Alexandrov's theorem asserts that spheres are the only closed embedded constant mean curvature hypersurfaces in space forms. In this paper, we consider Alexandrov's theorem in warped product manifolds and prove a rigidity result in the…

Analysis of PDEs · Mathematics 2018-04-24 Giulio Ciraolo , Alberto Roncoroni , Luigi Vezzoni

We give direct proofs and constructions of the trace and extension theorems for Sobolev mappings in $W^{1, 1} (M, N)$, where $M$ is Riemannian manifold with compact boundary $\partial M$ and $N$ is a complete Riemannian manifold. The…

Analysis of PDEs · Mathematics 2025-02-25 Jean Van Schaftingen , Benoît Van Vaerenbergh

We construct analytic surface symplectomorphisms with unstable elliptic fixed points; this solves a problem of Birkhoff (1927). More precisely, we construct analytic symplectomorphisms of the sphere and of the disk which are transitive,…

Dynamical Systems · Mathematics 2024-04-17 Pierre Berger

This survey paper addresses uniqueness questions for symplectic forms on closed manifolds, explains what is known in several examples, and reviews some open problems.

Symplectic Geometry · Mathematics 2012-12-14 Dietmar Salamon

In this article we consider integrable systems on manifolds endowed with singular symplectic structures of order one. These structures are symplectic away from an hypersurface where the symplectic volume goes either to infinity or to zero…

Symplectic Geometry · Mathematics 2023-06-16 Robert Cardona , Eva Miranda
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