The Hardy inequality and the heat equation with magnetic field in any dimension |
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Authors: | Cristian Cazacu |
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Institution: | 1. Department of Mathematics and Informatics, Faculty of Applied Sciences, University Politehnica of Bucharest, Bucharest, Romania;2. Simion Stoilow Institute of Mathematics of the Romanian Academy, Research Group of the Project PN-II-ID-PCE-2011-3-0075, Bucharest, Romania |
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Abstract: | In the Euclidean space of any dimension d, we consider the heat semigroup generated by the magnetic Schrödinger operator from which an inverse-square potential is subtracted to make the operator critical in the magnetic-free case. Assuming that the magnetic field is compactly supported, we show that the polynomial large-time behavior of the heat semigroup is determined by the eigenvalue problem for a magnetic Schrödinger operator on the (d ? 1)-dimensional sphere whose vector potential reflects the behavior of the magnetic field at the space infinity. From the spectral problem on the sphere, we deduce that in d = 2 there is an improvement of the decay rate of the heat semigroup by a polynomial factor with power proportional to the distance of the total magnetic flux to the discrete set of flux quanta, while there is no extra polynomial decay rate in higher dimensions. To prove the results, we establish new magnetic Hardy-type inequalities for the Schrödinger operator and develop the method of self-similar variables and weighted Sobolev spaces for the associated heat equation. |
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Keywords: | Aharonov-Bohm magnetic field Hardy inequality heat equation large time behaviour of solutions magnetic Schrödinger operator |
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