Comptes Rendus
Partial Differential Equations
Spectral instability of some non-selfadjoint anharmonic oscillators
[Instabilité spectrale de certains oscillateurs anharmoniques non-autoadjoints]
Comptes Rendus. Mathématique, Volume 350 (2012) no. 23-24, pp. 1043-1046.

Notre objectif est de mettre en évidence lʼinstabilité spectrale de certains opérateurs différentiels non-autoadjoints, via lʼétude de la croissance des normes des projecteurs spectraux Πn associés à leurs valeurs propres. Nous nous intéressons à certains oscillateurs anharmoniques A(m,θ)=d2dx2+eiθ|x|m avec |θ|<min{(m+2)π4,(m+2)π2m}, définis sur L2(R). Nous étendons les résultats de Davies (2000) [4] et Davies et Kuijlaars (2004) [5] en donnant un développement asymptotique de la norme des projecteurs spectraux associés aux grandes valeurs propres pour les opérateurs A(1,θ) et A(2k,θ), k1.

The purpose of this Note is to highlight the spectral instability of some non-selfadjoint differential operators, by studying the growth rate of the norms of the spectral projections Πn associated with their eigenvalues. More precisely, we are concerned with some anharmonic oscillators A(m,θ)=d2dx2+eiθ|x|m with |θ|<min{(m+2)π4,(m+2)π2m}, defined on L2(R). We get asymptotic expansions for the norm of the spectral projections associated with the large eigenvalues of A(1,θ) and A(2k,θ), k1, extending the results of Davies (2000) [4] and Davies and Kuijlaars (2004) [5].

Reçu le :
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DOI : 10.1016/j.crma.2012.11.011
Raphaël Henry 1

1 Université Paris-Sud, 91405 Orsay cedex, France
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Raphaël Henry. Spectral instability of some non-selfadjoint anharmonic oscillators. Comptes Rendus. Mathématique, Volume 350 (2012) no. 23-24, pp. 1043-1046. doi : 10.1016/j.crma.2012.11.011. https://comptes-rendus.academie-sciences.fr/mathematique/articles/10.1016/j.crma.2012.11.011/

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