Stability of eigenvalues of quantum graphs with respect to magnetic perturbation and the nodal count of the eigenfunctions
2014 ◽
Vol 372
(2007)
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pp. 20120522
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We prove an analogue of the magnetic nodal theorem on quantum graphs: the number of zeros ϕ of the n th eigenfunction of the Schrödinger operator on a quantum graph is related to the stability of the n th eigenvalue of the perturbation of the operator by magnetic potential. More precisely, we consider the n th eigenvalue as a function of the magnetic perturbation and show that its Morse index at zero magnetic field is equal to ϕ −( n −1).
1994 ◽
Vol 09
(39)
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pp. 3611-3618
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1984 ◽
Vol 45
(C1)
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pp. C1-495-C1-498
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2005 ◽
Vol 2005
(23)
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pp. 3727-3737
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2007 ◽
Vol 06
(03n04)
◽
pp. 173-177
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