02966nam 2200553Ia 450 991013278610332120200520144314.03-642-23840-810.1007/978-3-642-23840-6(CKB)3390000000021667(SSID)ssj0000610895(PQKBManifestationID)11973987(PQKBTitleCode)TC0000610895(PQKBWorkID)10644930(PQKB)10356187(DE-He213)978-3-642-23840-6(MiAaPQ)EBC3070566(PPN)159084814(EXLCZ)99339000000002166720120119d2012 uy 0engurnn|008mamaatxtccrSpectral analysis on graph-like spaces /Olaf Post1st ed. 2012.Berlin ;New York Springerc20121 online resource (XV, 431 p. 28 illus.) Lecture notes in mathematics,0075-8434 ;2039Bibliographic Level Mode of Issuance: Monograph3-642-23839-4 Includes bibliographical references and index.1 Introduction -- 2 Graphs and associated Laplacians -- 3 Scales of Hilbert space and boundary triples -- 4 Two operators in different Hilbert spaces -- 5 Manifolds, tubular neighbourhoods and their perturbations -- 6 Plumber’s shop: Estimates for star graphs and related spaces -- 7 Global convergence results.Small-radius tubular structures have attracted considerable attention in the last few years, and are frequently used in different areas such as Mathematical Physics, Spectral Geometry and Global Analysis.   In this monograph, we analyse Laplace-like operators on thin tubular structures ("graph-like spaces''), and their natural limits on metric graphs. In particular, we explore norm resolvent convergence, convergence of the spectra and resonances.   Since the underlying spaces in the thin radius limit change, and become singular in the limit, we develop new tools such as   -norm convergence of operators acting in different Hilbert  spaces,   - an extension of the concept of boundary triples to partial  differential operators, and   -an abstract definition of resonances via boundary triples.   These tools are formulated in an abstract framework, independent of the original problem of graph-like spaces, so that they can be applied in many other situations where the spaces are perturbed.Lecture notes in mathematics (Springer-Verlag) ;2039.Generalized spacesRelativity (Physics)Generalized spaces.Relativity (Physics)515/.782Post Olaf477397MiAaPQMiAaPQMiAaPQBOOK9910132786103321Spectral analysis on graph-like spaces239891UNINA