{"title":"Weyl asymptotics for fractional-order Dirichlet realizations in nonsmooth cases","authors":"Gerd Grubb","doi":"10.7146/math.scand.a-138002","DOIUrl":null,"url":null,"abstract":"Let $P$ be a symmetric $2a$-order classical strongly elliptic pseudodifferential operator with \\emph{even} symbol $p(x,\\xi)$ on $\\mathbb{R}^n $ ($0<a<1$), for example a perturbation of $(-\\Delta )^a$. Let $\\Omega \\subset \\mathbb{R}^n$ be bounded, and let $P_D$ be the Dirichlet realization in $L_2(\\Omega)$ defined under the exterior condition $u=0$ in $\\mathbb{R}^n\\setminus\\Omega$. When $p(x,\\xi)$ and $\\Omega$ are $C^\\infty $, it is known that the eigenvalues $\\lambda_j$ (ordered in a nondecreasing sequence for $j\\to \\infty$) satisfy a Weyl asymptotic formula \\begin{equation*} \\lambda _j(P_{D})=C(P,\\Omega )j^{2a/n}+o(j^{2a/n}) \\text {for $j\\to \\infty $}, \\end{equation*} with $C(P,\\Omega)$ determined from the principal symbol of $P$. We now show that this result is valid for more general operators with a possibly nonsmooth $x$-dependence, over Lipschitz domains, and that it extends to $\\tilde P=P+P'+P”$, where $P'$ is an operator of order $<\\min\\{2a, a+\\frac 12\\}$ with certain mapping properties, and $P”$ is bounded in $L_2(\\Omega )$ (e.g. $P”=V(x)\\in L_\\infty(\\Omega)$). Also the regularity of eigenfunctions of $P_D$ is discussed.","PeriodicalId":49873,"journal":{"name":"Mathematica Scandinavica","volume":"37 6","pages":"0"},"PeriodicalIF":0.3000,"publicationDate":"2023-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mathematica Scandinavica","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.7146/math.scand.a-138002","RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATHEMATICS","Score":null,"Total":0}
引用次数: 1
Abstract
Let $P$ be a symmetric $2a$-order classical strongly elliptic pseudodifferential operator with \emph{even} symbol $p(x,\xi)$ on $\mathbb{R}^n $ ($0
期刊介绍:
Mathematica Scandinavica is a peer-reviewed journal in mathematics that has been published regularly since 1953. Mathematica Scandinavica is run on a non-profit basis by the five mathematical societies in Scandinavia. It is the aim of the journal to publish high quality mathematical articles of moderate length.
Mathematica Scandinavica publishes about 640 pages per year. For 2020, these will be published as one volume consisting of 3 issues (of 160, 240 and 240 pages, respectively), enabling a slight increase in article pages compared to previous years. The journal aims to publish the first issue by the end of March. Subsequent issues will follow at intervals of approximately 4 months.
All back volumes are available in paper and online from 1953. There is free access to online articles more than five years old.