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On the essential spectrum of phase-space anisotropic pseudodifferential operators

Published online by Cambridge University Press:  02 July 2012

MARIUS MĂNTOIU
MARIUS MĂNTOIU*
Affiliation:
Departamento de Matemáticas, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Casilla 653, Santiago, Chile e-mail: [email protected]
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Abstract

A phase-space anisotropic operator in =L2(ℝn) is a self-adjoint operator whose resolvent family belongs to a natural C*-completion of the space of Hörmander symbols of order zero. Equivalently, each member of the resolvent family is norm-continuous under conjugation with the Schrödinger unitary representation of the Heisenberg group. The essential spectrum of such a phase-space anisotropic operator is the closure of the union of usual spectra of all its “phase-space asymptotic localizations”, obtained as limits over diverging ultrafilters of ℝn×ℝn-translations of the operator. The result extends previous analysis of the purely configurational anisotropic operators, for which only the behavior at infinity in ℝn was allowed to be non-trivial.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 154 , Issue 1 , January 2013 , pp. 29 - 39
Copyright
Copyright © Cambridge Philosophical Society 2012

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