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We study symplectic Laplacians on compact symplectic manifolds with boundary. These Laplacians are associated with symplectic cohomologies of differential forms and can be of fourth-order. We introduce several natural boundary conditions on…

Symplectic Geometry · Mathematics 2014-09-30 Li-Sheng Tseng , Lihan Wang

Consider a bounded domain with the Dirichlet condition on a part of the boundary and the Neumann condition on its complement. Does the spectrum of the Laplacian determine uniquely which condition is imposed on which part? We present some…

Spectral Theory · Mathematics 2007-05-23 Dmitry Jakobson , Michael Levitin , Nikolai Nadirashvili , Iosif Polterovich

We prove nonlinear lower bounds and commutator estimates for the Dirichlet fractional Laplacian in bounded domains. The applications include bounds for linear drift-diffusion equations with nonlocal dissipation and global existence of weak…

Analysis of PDEs · Mathematics 2015-11-03 Peter Constantin , Mihaela Ignatova

In this paper we introduce new characterizations of spectral fractional Laplacian to incorporate nonhomogeneous Dirichlet and Neumann boundary conditions. The classical cases with homogeneous boundary conditions arise as a special case. We…

Numerical Analysis · Mathematics 2017-09-12 Harbir Antil , Johannes Pfefferer , Sergejs Rogovs

For $\Pi \subset \mathbb{R}^2$ a connected, open, bounded set whose boundary is a finite union of disjoint polygons whose vertices have integer coordinates, the logarithm of the discrete Laplacian on $L\Pi \cap \mathbb{Z}^2$ with Dirichlet…

Mathematical Physics · Physics 2023-04-19 Rafael Leon Greenblatt

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

Inequalities for the eigenvalues of the (negative) Laplacian subject to mixed boundary conditions on polyhedral and more general bounded domains are established. The eigenvalues subject to a Dirichlet boundary condition on a part of the…

Spectral Theory · Mathematics 2016-09-12 Vladimir Lotoreichik , Jonathan Rohleder

In this paper, we study fully nonlinear second-order elliptic and parabolic equations with Neumann boundary conditions on compact Riemannian manifolds with smooth boundary. We derive oscillation bounds for admissible solutions with Neumann…

Analysis of PDEs · Mathematics 2020-01-06 Sheng Guo

The orthogonality of Hilbert spaces whose elements can be represented as simple and double layer potentials is determined. Conditions of well-posed solvability of integral equations for the sum of simple and double layer potentials…

Numerical Analysis · Mathematics 2020-01-20 Olexandr Polishchuk

We consider a general second-order elliptic differential operator on a domain with a cylindrical end. We impose Dirichlet boundary conditions on the boundary with the exception of a small set, where we impose Neumann boundary conditions.…

Spectral Theory · Mathematics 2017-10-06 André Froehly

This article is concerned with maximal accretive realizations of geometric Kramers-Fokker-Planck operators on manifolds with boundaries. A general class of boundary conditions is introduced which ensures the maximal accretivity and some…

Analysis of PDEs · Mathematics 2014-02-04 Francis Nier

We consider a waveguide modeled by the Laplacian in a straight planar strip. The Dirichlet boundary condition is taken on the upper boundary, while on the lower boundary we impose periodically alternating Dirichlet and Neumann condition…

Spectral Theory · Mathematics 2015-05-20 Denis Borisov , Renata Bunoiu , Giuseppe Cardone

An extension of the lower-bound lemma of Boggio is given for the weak forms of certain elliptic operators, which have partially Dirichlet and partially Neumann boundary conditions, and are in general nonlinear. Its consequences and those of…

Spectral Theory · Mathematics 2007-05-23 Evans M. Harrell

We introduce new boundary conditions for differential forms on symplectic manifolds with boundary. These boundary conditions, dependent on the symplectic structure, allows us to write down elliptic boundary value problems for both…

Symplectic Geometry · Mathematics 2021-04-14 Li-Sheng Tseng , Lihan Wang

In this work we consider higher dimensional thin domains with the property that both boundaries, bottom and top, present oscillations of weak type. We consider the Laplace operator with Neumann boundary conditions and analyze the behavior…

Analysis of PDEs · Mathematics 2024-05-10 José M. Arrieta , Manuel Villanueva-Pesqueira

Recently Rohleder proposed a new variational approach to an inequality between the Neumann and Dirichlet eigenvalues in the simply connected planar case using the language of classical vector analysis. Writing his approach in terms of…

Differential Geometry · Mathematics 2025-01-30 Muravyev Mikhail

To every Hermitian vector bundle with connection over a compact Riemannian manifold $M$ one can associate a corresponding connection Laplacian acting on the sections of the bundle. We define analogous combinatorial metric dependent…

Spectral Theory · Mathematics 2016-02-23 Svetoslav Zahariev

We study in this article the combined asymptotic analysis of Bismut's hypoelliptic Laplacian, in the high friction b $\rightarrow$ 0+ and possibly low temperature h $\rightarrow$ 0+ regimes.

Analysis of PDEs · Mathematics 2025-12-31 Xingfeng Sang , Francis White , Francis Nier

The eigenvalue problem for the Laplacian on bounded, planar, convex domains with mixed boundary conditions is considered, where a Dirichlet boundary condition is imposed on a part of the boundary and a Neumann boundary condition on its…

Spectral Theory · Mathematics 2023-01-26 Nausica Aldeghi , Jonathan Rohleder

Double forms are sections of the vector bundles $\Lambda^{k}T^*\mathcal{M}\otimes \Lambda^{m}T^*\mathcal{M}$, where in this work $(\mathcal{M},\mathfrak{g})$ is a compact Riemannian manifold with boundary. We study graded second-order…

Analysis of PDEs · Mathematics 2021-12-28 Raz Kupferman , Roee Leder
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