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JOURNALS // Izvestiya Rossiiskoi Akademii Nauk. Seriya Matematicheskaya // Archive

Izv. RAN. Ser. Mat., 2022 Volume 86, Issue 4, Pages 3–50 (Mi im9179)

This article is cited in 2 papers

Canonical form of the $C^*$-algebra of eikonals related to a metric graph

M. I. Belishev, A. V. Kaplun

St. Petersburg Department of Steklov Mathematical Institute of Russian Academy of Sciences

Abstract: The eikonal algebra $\mathfrak E$ of a metric graph $\Omega$ is an operator $C^*$-algebra defined by the dynamical system which describes the propagation of waves generated by sources supported at the boundary vertices of $\Omega$. This paper describes the canonical block form of the algebra $\mathfrak E$ for an arbitrary compact connected metric graph. Passing to this form is equivalent to constructing a functional model which realizes $\mathfrak E$ as an algebra of continuous matrix-valued functions on its spectrum $\widehat{\mathfrak{E}}$. The results are intended to be used in the inverse problem of recovering the graph from spectral and dynamical boundary data.

Keywords: dynamical system on a metric graph, reachable sets, eikonal $C^*$-algebra, canonical form.

UDC: 517.538

MSC: 35Q41, 35B30, 47N70, 46N20, 78A05

Received: 22.04.2021
Revised: 09.10.2021

DOI: 10.4213/im9179


 English version:
Izvestiya: Mathematics, 2022, 86:4, 621–666

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© Steklov Math. Inst. of RAS, 2025