Spectral shift and multiplicity of the first eigenvalue of the magnetic Schrödinger operator in two dimensions
Annales de l'Institut Fourier, Volume 52 (2002) no. 6, pp. 1833-1874

We show that the lowest eigenvalue of the magnetic Schrödinger operator on a line bundle over a compact Riemann surface M is bounded by the L 1 -norm of the magnetic field B. This implies a similar bound on the multiplicity of the ground state. An example shows that this degeneracy can indeed be comparable with M |B| even in case of the trivial bundle.

On démontre que la première valeur propre de l’opérateur de Schrödinger avec champ magnétique sur un fibré en droites au-dessus d’une surface riemannienne compacte M est majorée par la norme L 1 du champ magnétique B. On en déduit une borne analogue pour la multiplicité de l’état fondamental. Un exemple démontre que cette multiplicité peut être comparable avec M |B| même dans le cas du fibré trivial.

DOI: 10.5802/aif.1936
Classification: 35P15, 58J35, 81Q10
Keywords: magnetic laplacian, multiplicity of the ground state, Riemann surface
Mots-clés : laplacien magnétique, multiplicité de l'état fondamental, surface riemannienne

Erdős, László  1

1 Georgia Institute of Technology, School of Mathematics, Atlanta GA 30332 (USA)
Erdős, László. Spectral shift and multiplicity of the first eigenvalue of the magnetic Schrödinger operator in two dimensions. Annales de l'Institut Fourier, Volume 52 (2002) no. 6, pp. 1833-1874. doi: 10.5802/aif.1936
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