Partial Differential Equations
Spectral instability of some non-selfadjoint anharmonic oscillators
[Instabilité spectrale de certains oscillateurs anharmoniques non-autoadjoints]
Comptes Rendus. Mathématique, Tome 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].

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DOI : 10.1016/j.crma.2012.11.011
Henry, Raphaël 1

1 Université Paris-Sud, 91405 Orsay cedex, France
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Henry, Raphaël. Spectral instability of some non-selfadjoint anharmonic oscillators. Comptes Rendus. Mathématique, Tome 350 (2012) no. 23-24, pp. 1043-1046. doi : 10.1016/j.crma.2012.11.011. http://www.numdam.org/articles/10.1016/j.crma.2012.11.011/

[1] Abramowitz, M.; Stegun, I. Handbook of Mathematical Functions, National Bureau of Standards, 1964

[2] Almog, Y. The stability of the normal state of superconductors in the presence of electric currents, SIAM J. Math. Anal., Volume 40 (2008) no. 2, pp. 824-850

[3] Aslanyan, A.; Davies, E.-B. Spectral instability for some Schrödinger operators, Numer. Math., Volume 85 (2000), pp. 525-552

[4] Davies, E.-B. Wild spectral behaviour of anharmonic oscillators, Bull. London Math. Soc., Volume 32 (2000), pp. 432-438

[5] Davies, E.-B.; Kuijlaars, A. Spectral asymptotics of the non-self-adjoint harmonic oscillator, J. London Math. Soc. (2), Volume 70 (2004), pp. 420-426

[6] Gérard, C.; Grigis, A. Precise estimates of tunneling and eigenvalues near a potential barrier, J. Differential Equations, Volume 72 (1988), pp. 149-177

[7] Grigis, A.; Sjöstrand, J. Microlocal Analysis for Differential Operators: An Introduction, London Math. Soc. Lecture Note Ser., vol. 196, 1994

[8] Helffer, B. On pseudo-spectral problems related to a time dependent model in superconductivity with electric current, Confluentes Math., Volume 3 (2011) no. 2, pp. 237-251

[9] Helffer, B.; Robert, D. Asymptotique des niveaux dʼénergie pour des hamiltoniens à un degré de liberté, Duke Math. J., Volume 49 (1982) no. 4, pp. 853-868

[10] Olver, F.W.J. Asymptotics and Special Functions, Academic Press, 1974

[11] Roch, S.; Silbermann, B. C-algebras techniques in numerical analysis, J. Operator Theory, Volume 35 (1996), pp. 241-280

[12] J. Sjöstrand, Lecture notes: Spectral properties of non-self-adjoint operators, Journ. Equ. Dériv. Partielles (2009), Exp. No. I, 111 pp.

[13] Trefethen, L.N.; Embree, M. Spectra and Pseudospectra. The Behavior of Nonnormal Matrices and Operators, Princeton University Press, Princeton, NJ, 2005

[14] A. Voros, Spectre de lʼéquation de Schrödinger et méthode BKW, Publications Mathématiques dʼOrsay, 81.09, 1981.

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