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This article is devoted the semiclassical spectral analysis of the Neumann magnetic Laplacian on a smooth bounded domain in three dimensions. Under a generic assumption on the variable magnetic field (involving a localization of the…

Spectral Theory · Mathematics 2023-07-03 Khaled Abou Alfa , Maha Aafarani , Frédéric Hérau , Nicolas Raymond

In this paper we look for the domains minimizing the h-th eigenvalue of the Dirichlet-Laplacian $\lambda$ h with a constraint on the diameter. Existence of an optimal domain is easily obtained, and is attained at a constant width body. In…

Analysis of PDEs · Mathematics 2018-01-08 B Bogosel , A Henrot , I Lucardesi

This paper is concerned with spectrum properties of the magnetic Laplacian with a higher-order vanishing magnetic field in a bounded domain. We study the asymptotic behaviors of ground state energies for the Dirichlet Laplacian, the Neumann…

Analysis of PDEs · Mathematics 2025-05-07 Zhongwei Shen

Motivated by relativistic materials, we develop a numerical scheme to support existing or state new conjectures in the spectral optimisation of eigenvalues of the Dirac operator, subject to infinite-mass boundary conditions. We study the…

Optimization and Control · Mathematics 2025-02-05 Pedro R. S. Antunes , Francisco Bento , David Krejcirik

The asymptotic behavior of the first eigenvalues of magnetic Laplacian operators with large magnetic fields and Neumann realization in smooth three-dimensional domains is characterized by model problems inside the domain or on its boundary.…

Spectral Theory · Mathematics 2017-11-23 Virginie Bonnaillie-Noël , Monique Dauge , Nicolas Popoff

In this paper, we consider the optimization problem for the first Dirichlet eigenvalue $\lambda_1(\Omega)$ of the $p$-Laplacian $\Delta_p$, $1< p< \infty$, over a family of doubly connected planar domains $\Omega= B \setminus \overline{P}$,…

Analysis of PDEs · Mathematics 2022-09-20 Anisa M. H. Chorwadwala , Mrityunjoy Ghosh

This paper is devoted to the spectral analysis of the Laplacian with constant magnetic field on a cone of aperture $\alpha$ and Neumann boundary condition. We analyze the influence of the orientation of the magnetic field. In particular,…

Analysis of PDEs · Mathematics 2013-09-11 Virginie Bonnaillie-Noël , Nicolas Raymond

We study the eigenvalue problem for the Dirichlet Laplacian in bounded simply connected plane domains $\Omega\subset\mathbb{C}$ using conformal transformations of the original problem to the weighted eigenvalue problem for the Dirichlet…

Spectral Theory · Mathematics 2015-04-07 Victor Burenkov , Vladimir Gol'dshtein , Alexander Ukhlov

The semiclassical Laplacian with discontinuous magnetic field is considered in two dimensions. The magnetic field is sign changing with exactly two distinct values and is discontinuous along a smooth closed curve, thereby producing an…

Spectral Theory · Mathematics 2022-07-28 Soeren Fournais , Bernard Helffer , Ayman Kachmar , Nicolas Raymond

In this paper, we study the first eigenvalue of the magnetic Laplacian with Neumann boundary conditions in the unit disk $\mathbb D$ in $\mathbb R^2$. There is a rather complete asymptotic analysis when the constant magnetic field tends to…

Spectral Theory · Mathematics 2025-08-25 Bernard Helffer , Corentin Léna

We consider the Laplace operator with Dirichlet boundary conditions on a domain in R^d and study the effect that performing a scaling in one direction has on the eigenvalues and corresponding eigenfunctions as a function of the scaling…

Analysis of PDEs · Mathematics 2009-08-18 Denis Borisov , Pedro Freitas

The sum of the first $n \geq 1$ eigenvalues of the Laplacian is shown to be maximal among triangles for the equilateral triangle, maximal among parallelograms for the square, and maximal among ellipses for the disk, provided the ratio…

Spectral Theory · Mathematics 2010-09-28 R. S. Laugesen , B. A. Siudeja

This paper is concerned with the magnetic Laplacian $P^h (\A)=(h D+\A)^2$ in semiclassical analysis, where $h$ is a semiclassical parameter. We study the $L^2$ Neumann and Dirichlet problems for the equation $P^h(\A)u=0$ in a bounded…

Analysis of PDEs · Mathematics 2025-09-03 Zhongwei Shen

We consider the nonlinear eigenvalue problem, with Dirichlet boundary condition, for a class of very degenerate elliptic operators, with the aim to show that, at least for square type domains having fixed volume, the symmetry of the domain…

Analysis of PDEs · Mathematics 2018-03-21 Isabeau Birindelli , Giulio Galise , Hitoshi Ishii

We obtain an upper bound on the lowest magnetic Neumann eigenvalue of a bounded, convex, smooth, planar domain with moderate intensity of the homogeneous magnetic field. This bound is given as a product of a purely geometric factor…

Spectral Theory · Mathematics 2023-12-12 Ayman Kachmar , Vladimir Lotoreichik

We consider the Laplacian in a domain squeezed between two parallel hypersurfaces in Euclidean spaces of any dimension, subject to Dirichlet boundary conditions on one of the hypersurfaces and Neumann boundary conditions on the other. We…

Spectral Theory · Mathematics 2014-07-29 David Krejcirik

This paper is devoted to the spectral analysis of the Neumann realization of the 2D magnetic Laplacian with semiclassical parameter h > 0 in the case when the magnetic field vanishes along a smooth curve which crosses itself inside a…

Analysis of PDEs · Mathematics 2022-07-27 Monique Dauge , Jean-Philippe Miqueu , Nicolas Raymond

We consider a compact Riemannian manifold M endowed with a potential 1-form A and study the magnetic Laplacian associated with those data (with Neumann magnetic boundary condition if the bpoundary of M is not empty). We first establish a…

Differential Geometry · Mathematics 2016-11-08 Bruno Colbois , Alessandro Savo

The existence of bound states for the magnetic Laplacian in unbounded domains can be quite challenging in the case of a homogeneous magnetic field. We provide an affirmative answer for almost flat corners and slightly curved half-planes…

Spectral Theory · Mathematics 2022-08-30 Virginie Bonnaillie-Noël , Søren Fournais , Ayman Kachmar , Nicolas Raymond

We continue the analysis started in [Noris,Terracini,Indiana Univ Math J,2010] and [Bonnaillie-No\"el,Noris,Nys,Terracini,Analysis & PDE,2014], concerning the behavior of the eigenvalues of a magnetic Schr\"odinger operator of Aharonov-Bohm…

Analysis of PDEs · Mathematics 2014-11-20 Benedetta Noris , Manon Nys , Susanna Terracini