Search Results - "Naboko, Serguei"

Moment analysis for localization in random Schrödinger operators by Aizenman, Michael, Elgart, Alexander, Naboko, Serguei, Schenker, Jeffrey H., Stolz, Gunter

“…We study localization effects of disorder on the spectral and dynamical properties of Schrödinger operators with random potentials. The new results include…”
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The critical temperature for the BCS equation at weak coupling by Frank, Rupert L., Hainzl, Christian, Naboko, Serguei, Seiringer, Robert

“…For the BCS equation with local two-body interaction lambda V(x), we give a rigorous analysis of the asymptotic behavior of the critical temperature as lambda…”
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Generalized Polar Decompositions for Closed Operators in Hilbert Spaces and Some Applications by Gesztesy, Fritz, Malamud, Mark, Mitrea, Marius, Naboko, Serguei

“… We study generalized polar decompositions of densely defined closed linear operators in Hilbert spaces and provide some applications to relatively (form)…”
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Nonself-adjoint operators with almost Hermitian spectrum: Matrix model. I by Kiselev, Alexander V., Naboko, Serguei N.

“…Nonself-adjoint, nondissipative perturbations of bounded self-adjoint operators with real purely singular spectrum are considered. Using a functional model of…”
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On the point spectrum of periodic Jacobi matrices with matrix entries: elementary approach by Janas, Jan, Naboko, Serguei

“…This work consists of two parts. The first one contains a characterization (localization) of the point spectrum of one sided, infinite and periodic Jacobi…”
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Essential spectrum of a system of singular differential operators and the asymptotic Hain--Lüst operator by Mennicken, Reinhard, Naboko, Serguei, Tretter, Christiane

“…We consider a matrix differential operator with singular entries which arises in magnetohydrodynamics. By means of the asymptotic Hain-Lüst operator and some…”
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Jacobi matrices with absolutely continuous spectrum by Janas, Jan, Naboko, Serguei

“…Let J be a Jacobi matrix defined in l^2 as Re W, where W is a unilateral weighted shift with nonzero weights \lambda_k such that \lim_k \lambda_k = 1. Define…”
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Boundary triplets and M-functions for non-selfadjoint operators, with applications to elliptic PDEs and block operator matrices by Brown, Malcolm, Marletta, Marco, Naboko, Serguei, Wood, Ian

“…Starting with an adjoint pair of operators, under suitable abstract versions of standard PDE hypotheses, we consider the Weyl M-function of extensions of the…”
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Unbounded Jacobi matrices at critical coupling by Damanik, David, Naboko, Serguei

“…We consider a class of Jacobi matrices with unbounded coefficients. This class is known to exhibit a first-order phase transition in the sense that, as a…”
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Discrete spectrum in a critical coupling case of Jacobi matrices with spectral phase transitions by uniform asymptotic analysis by Naboko, Serguei, Pchelintseva, Irina, Silva, Luis O.

“…For a two-parameter family of Jacobi matrices exhibiting first-order spectral phase transitions, we prove discreteness of the spectrum in the positive real…”
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The Abstract Titchmarsh-Weyl M-function for Adjoint Operator Pairs and its Relation to the Spectrum by Brown, Malcolm, Hinchcliffe, James, Marletta, Marco, Naboko, Serguei, Wood, Ian

“… In the setting of adjoint pairs of operators we consider the question: to what extent does the Weyl M -function see the same singularities as the resolvent…”
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Unbounded Jacobi Matrices with a Few Gaps in the Essential Spectrum: Constructive Examples by de Monvel, Anne Boutet, Janas, Jan, Naboko, Serguei

“…We give explicit examples of unbounded Jacobi operators with a few gaps in their essential spectrum. More precisely a class of Jacobi matrices whose absolutely…”
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Nonself-adjoint operators with almost Hermitian spectrum: Cayley identity and some questions of spectral structure by Kiselev, Alexander V., Naboko, Serguei

“…Nonself-adjoint, non-dissipative perturbations of possibly unbounded self-adjoint operators with real purely singular spectrum are considered under an…”
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Titchmarsh-Weyl formula for the spectral density of a class of Jacobi matrices in the critical case by Naboko, Serguei, Simonov, Sergey

“…We consider a class of Jacobi matrices with unbounded entries in the so called critical (double root, Jordan box) case. We prove a formula for the spectral…”
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The Inverse Resonance Problem for Hermite Operators by Brown, B. Malcolm, Naboko, Serguei, Weikard, Rudi

“…In this paper the inverse resonance problem for the Hermite operator is investigated. The Hermite operator with the creation operator , the annihilation…”
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Decay Bounds on Eigenfunctions and the Singular Spectrum of Unbounded Jacobi Matrices by Janas, Jan, Naboko, Serguei, Stolz, Günter

“…Bounds on the exponential decay of generalized eigenfunctions of bounded and unbounded selfadjoint Jacobi matrices in are established. Two cases are considered…”
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Spectral Analysis of Selfadjoint Jacobi Matrices with Periodically Modulated Entries by Janas, Jan, Naboko, Serguei

“…This paper deals with the spectral analysis of a class of selfadjoint unbounded Jacobi matrices J with modulated entries. The entries have the form of smooth…”
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Complete Non-Selfadjointness for Schr\"odinger Operators on the Semi-Axis by Fischbacher, Christoph, Naboko, Serguei, Wood, Ian

“…In this note we investigate complete non-selfadjointness for all maximally dissipative extensions of a Schr\"odinger operator on a half-line with dissipative…”
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Spectral theory for a class of periodically perturbed unbounded Jacobi matrices: elementary methods by Janas, Jan, Naboko, Serguei, Stolz, Gunter

“…We use elementary methods to give a full characterization of the spectral properties of unbounded Jacobi matrices with zero diagonal and off-diagonal entries…”
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Jacobi Matrices with Power-like Weights—Grouping in Blocks Approach by Janas, Jan, Naboko, Serguei

“…The paper deals with Jacobi matrices with weights λk given by λk=kα(1+Δk), where α∈(12, 1) and limkΔk=0. The main question studied here concerns when the…”
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