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 est majorée par la norme du champ magnétique . On en déduit une borne analogue pour la multiplicité de l’état fondamental. Un exemple démontre que cette multiplicité peut être comparable avec même dans le cas du fibré trivial.
We show that the lowest eigenvalue of the magnetic Schrödinger operator on a line bundle over a compact Riemann surface is bounded by the -norm of the magnetic field . This implies a similar bound on the multiplicity of the ground state. An example shows that this degeneracy can indeed be comparable with even in case of the trivial bundle.
@article{AIF_2002__52_6_1833_0, author = {Erd\H os, L\'aszl\'o}, title = {Spectral shift and multiplicity of the first eigenvalue of the magnetic Schr\"odinger operator in two dimensions}, journal = {Annales de l'Institut Fourier}, volume = {52}, year = {2002}, pages = {1833-1874}, doi = {10.5802/aif.1936}, mrnumber = {1954326}, zbl = {1106.35039}, language = {en}, url = {http://dml.mathdoc.fr/item/AIF_2002__52_6_1833_0} }
Erdős, László. Spectral shift and multiplicity of the first eigenvalue of the magnetic Schrödinger operator in two dimensions. Annales de l'Institut Fourier, Tome 52 (2002) pp. 1833-1874. doi : 10.5802/aif.1936. http://gdmltest.u-ga.fr/item/AIF_2002__52_6_1833_0/
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