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Eigenvalues and subelliptic estimates for non-selfadjoint semiclassical operators with double characteristics

Michael Hitrik, Karel Pravda-Starov (2013)

Annales de l’institut Fourier

For a class of non-selfadjoint h –pseudodifferential operators with double characteristics, we give a precise description of the spectrum and establish accurate semiclassical resolvent estimates in a neighborhood of the origin. Specifically, assuming that the quadratic approximations of the principal symbol of the operator along the double characteristics enjoy a partial ellipticity property along a suitable subspace of the phase space, namely their singular space, we give a precise description of...

Étude spectrale d'opérateurs hypoelliptiques à caractéristiques multiples. I

Abderemane Mohamed (1982)

Annales de l'institut Fourier

Nous donnons le comportement asymptotique de valeurs propres d’opérateurs pseudodifférentiels autoadjoints, hypoelliptiques avec perte de k dérivées dans le cas où la variété caractéristique est symplectique. Nous généralisatons ainsi la formule du N ± ( λ ) relative aux opérateurs à caractéristiques doubles établie par A. Menikoff et J. Sjöstrand.

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