04-224 Emanuela Caliceti, Sandro Graffi, Johannes Sjoestrand
SPECTRA OF PT-SYMMETRIC OPERATORS AND PERTURBATION THEORY (33K, latex) Jul 22, 04
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Abstract. Criteria are formulated both for the existence and for the non-existence of complex eigenvalues for a class of non self-adjoint operators in Hilbert space invarariant under a particular discrete symmetry. Applications to the PT-symmetric Schr\"odinger operators are discussed.

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