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Lieb-Thirring Inequalities for Fourth-Order Operators in Low Dimensions
Lund University.
KTH, School of Engineering Sciences (SCI), Mathematics (Dept.). (
(English)Manuscript (Other academic)
National Category
URN: urn:nbn:se:kth:diva-9978OAI: diva2:173778
QC 20100712Available from: 2009-02-17 Created: 2009-02-17 Last updated: 2012-01-27Bibliographically approved
In thesis
1. Properties of the Discrete and Continuous Spectrum of Differential Operators
Open this publication in new window or tab >>Properties of the Discrete and Continuous Spectrum of Differential Operators
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis contains three scientific papers devoted to the study of different spectral theoretical aspects of differential operators in Hilbert spaces.The first paper concerns the magnetic Schrödinger operator (i∇ + A)2 in L2(ℝn). It is proved that given certain conditions on the decay of A, the set [0,∞) is an essential support of the absolutely continuous part of the spectral measure corresponding to the operator.The second paper considers a regular d-dimensional metric tree Γ and defines Schrödinger operators - Δ - V on it.  Here, V is a symmetric, non-negative potential on Γ. It is assumed that V decays like lxl at infinity, where 1 < γ ≤ d ≤2, γ ≠ 2. A weak coupling constant α is introduced in front of V, and the asymptotics of the bottom of the spectrum as α → 0+ is described.The third, and last, paper revolves around fourth-order differential operators in the space L2(ℝn), where n = 1 or n = 3.  In particular, the operator (-Δ)2 - C|x|-4 - V(x) is studied, where C is the sharp constant in the Hardy-Rellich inequality. A Lieb-Thirring inequality for this operator is proved, and as a consequence a Sobolev-type inequality is obtained.


Place, publisher, year, edition, pages
Stockholm: KTH, 2009. vii, 30 p.
Trita-MAT. MA, ISSN 1401-2278 ; 09:02
National Category
urn:nbn:se:kth:diva-9981 (URN)978-91-7415-227-2 (ISBN)
Public defence
2009-02-27, F3, KTH, Lindstedtsvägen 26, Stockholm, 14:00 (English)
QC 20100712Available from: 2009-02-18 Created: 2009-02-17 Last updated: 2010-07-12Bibliographically approved

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Ekholm, TomasEnblom, Andreas
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