# Eigenvalue estimates and asymptotics for weighted pseudodifferential operators with singular measures in the critical case

### Grigori Rozenblum

Chalmers University of Technology, Göteborg, Sweden; St. Petersburg State University; Russian Federation### Eugene Shargorodsky

King's College London, UK; Technische Universität Dresden, Germany

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## Abstract

We consider self-adjoint operators of the form $\mathbf{T}_{P,\mathfrak{A}}=\mathfrak{A}^* P \mathfrak{A}$ in a domain $\Omega\subset\mathbb{R}^\mathbf{N}$, where $\mathfrak{A}$ is an order $-l=-\frac{\mathbf{N}}{2}$ pseudodifferential operator in $\Omega$ and $P$ is a signed Borel measure with compact support in $\Omega$. Measure $P$ may contain singular component. For a wide class of measures we establish eigenvalue estimates for operator $\mathbf{T}_{P,\mathfrak{A}}$. In case of measure $P$ being absolutely continuous with respect to the Hausdorff measure on a Lipschitz surface of an arbitrary dimension, we find the eigenvalue asymptotics. The order of eigenvalue estimates and asymptotics does not depend on dimensional characteristics of the measure, in particular, on the dimension of the surface supporting the measure.