Pseudodifferential Operators on Locally Compact Abelian Groups and Sjoestrand's Symbol Class

Details Pseudodifferential Operators on Locally Compact Abelian Groups and Sjoestrand's Symbol Class Pseudodifferential Operators on Locally Compact Abelian Groups and Sjoestrand's Symbol Class

2006-04-12

arxiv.org/abs/math/0604294v1

Mathematics

Functional Analysis

Scientific paper

We investigate pseudodifferential operators on arbitrary locally compact abelian groups. As symbol classes for the Kohn-Nirenberg calculus we introduce a version of Sjoestrand's class. Pseudodifferential operators with such symbols form a Banach algebra that is closed under inversion. Since "hard analysis" techniques are not available on locally compact abelian groups, a new time-frequency approach is used with the emphasis on modulation spaces, Gabor frames, and Banach algebras of matrices. Sjoestrand's original results are thus understood as a phenomenon of abstract harmonic analysis rather than "hard analysis" and are proved in their natural context and generality.

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