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It is shown that natural boundary conditions for non-relativistic wave functions are of periodic or of homogeneous Robin type. Using asymptotic central symmetry of Hamiltonian and theory of singular differential equations the many-electron…

Quantum Physics · Physics 2015-03-17 Péter V. Tóth

We study the statistics and the arithmetic properties of the Robin spectrum of a rectangle. A number of results are obtained for the multiplicities in the spectrum, depending on the Diophantine nature of the aspect ratio. In particular, it…

Spectral Theory · Mathematics 2021-11-24 Zeév Rudnick , Igor Wigman

In this paper, we consider eigenvalues of the Dirichlet biharmonic operator on a bounded domain in a hyperbolic space. We obtain universal bounds on the $(k+1)$th eigenvalue in terms of the first $k$th eigenvalue independent of the domains.

Differential Geometry · Mathematics 2009-10-23 Guangyue Huang , Xingxiao Li

We prove a Faber-Krahn inequality for the Laplacian with drift under Robin boundary condition, provided that the $\beta$ parameter in the Robin condition is large enough. The proof relies on a compactness argument, on the convergence of…

Analysis of PDEs · Mathematics 2024-05-21 François Hamel , Emmanuel Russ

We prove H\"older continuity up to the boundary for solutions of quasi-linear degenerate elliptic problems in divergence form, not necessarily of variational type, on Lipschitz domains with Neumann and Robin boundary conditions. This…

Analysis of PDEs · Mathematics 2011-04-28 Robin Nittka

We consider Laplace's equation in a periodically perforated domain with Robin boundary conditions on the holes, where the Robin coefficient is scaled proportionally to the inverse total surface area of the performations. We identify a…

Analysis of PDEs · Mathematics 2026-05-06 Giacomo Canevari , Kirill Cherednichenko , Arghir Zarnescu

Using Weitzenb\"ock techniques on any compact Riemannian spin manifold we derive inequalities that involve a real parameter and join the eigenvalues of the Dirac operator with curvature terms. The discussion of these inequalities yields…

Differential Geometry · Mathematics 2009-11-10 K. -D. Kirchberg

In this paper, we study a class of boundary value problems (BVPs) with Robin conditions in some $L^p$ spaces for polyharmonic equation on Lipschitz domains. Utilizing polyharmonic fundamental solutions, these Robin BVPs are solved by the…

Analysis of PDEs · Mathematics 2019-06-18 Weifeng Li , Pei Dang , Zhihua Du , Guoan Guo , Yumei Li

Comparison results of Talenti type for Elliptic Problems with Dirichlet boundary conditions have been widely investigated in the last decades. In this paper, we deal with Robin boundary conditions. Surprisingly, contrary to the Dirichlet…

Analysis of PDEs · Mathematics 2020-06-16 A. Alvino , C. Nitsch , C. Trombetti

(Version 3) We study the problem of finding functions, defined within and on an ellipse, whose Laplacian is -1 and which satisfy a homogeneous Robin boundary condition on the ellipse. The parameter in the Robin condition is denoted by beta.…

Analysis of PDEs · Mathematics 2020-07-16 Grant Keady , Benchawan Wiwatanapataphee

Motivated by the study of high energy Steklov eigenfunctions, we examine the semi-classical Robin Laplacian. In the two dimensional situation, we determine an effective operator describing the asymptotic distribution of the negative…

Spectral Theory · Mathematics 2021-02-16 B. Helffer , A. Kachmar

We study the behaviour, when $p \to +\infty$, of the first $p$-Laplacian eigenvalues with Robin boundary conditions and the limit of the associated eigenfunctions. We prove that the limit of the eigenfunctions is a viscosity solution to an…

Analysis of PDEs · Mathematics 2024-01-09 Vincenzo Amato , Alba Lia Masiello , Carlo Nitsch , Cristina Trombetti

We obtain shape derivative formulae for the first eigenvalue of the Robin $p$-Laplace operator. This result is used to study the variation of the first eigenvalue with respect to perturbations of the domain. In particular, we prove that for…

Analysis of PDEs · Mathematics 2024-01-17 Ardra A , Mohan Mallick , Sarath Sasi

We exploit the connection between quantum dot Dirac operators and $\overline\partial$-Robin Laplacians. First, we find a graphical relation between their smallest positive eigenvalues, which allows us to deduce a recipe for translating…

Analysis of PDEs · Mathematics 2026-05-29 Joaquim Duran

We consider a compact Riemannian manifold with boundary and a metric that is singular at the boundary. The associated Laplace-Beltrami operator is of the form of a Grushin operator plus a singular potential. In a supercritical parameter…

Analysis of PDEs · Mathematics 2024-10-29 Charlotte Dietze , Larry Read

We consider the problem of minimising the $k$th eigenvalue, $k \geq 2$, of the ($p$-)Laplacian with Robin boundary conditions with respect to all domains in $\mathbb{R}^N$ of given volume $M$. When $k=2$, we prove that the second eigenvalue…

Analysis of PDEs · Mathematics 2010-10-07 J. B. Kennedy

We study the Schr\"{o}dinger operator with a constant magnetic field in the exterior of a compact domain in euclidean space. Functions in the domain of the operator are subject to a boundary condition of the third type (a magnetic Robin…

Spectral Theory · Mathematics 2017-06-26 Magnus Goffeng , Ayman Kachmar , Mikael Persson Sundqvist

We define the weak intermediate boundary conditions for the triharmonic operator $- \Delta^3$. We analyse the sensitivity of this type of boundary conditions upon domain perturbations. We construct a perturbation…

Analysis of PDEs · Mathematics 2022-06-15 Francesco Ferraresso

In this paper we study the fractional p(., .)-Laplacian and we introduce the corresponding nonlocal conormal derivative for this operator. We prove basic properties of the corresponding function space and we establish a nonlocal version of…

Analysis of PDEs · Mathematics 2020-10-28 Anouar Bahrouni , Vicentiu Radulescu , Patrick Winkert

In this paper, we establish a new result for the Laplace problem with exponential Robin boundary conditions posed on the unit disk in $\R^2$. More precisely, we prove the existence and uniqueness of a solution under suitable smallness…

Analysis of PDEs · Mathematics 2026-03-03 Jamel Benameur , Chokri Elhechmi , Gmar Benhenda