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A groupoid approach to pseudodifferential calculi

  • Erik van Erp EMAIL logo and Robert Yuncken ORCID logo
Published/Copyright: September 7, 2017

Abstract

In this paper we give an algebraic/geometric characterization of the classical pseudodifferential operators on a smooth manifold in terms of the tangent groupoid and its natural +×-action. Specifically, a properly supported semiregular distribution on M×M is the Schwartz kernel of a classical pseudodifferential operator if and only if it extends to a smooth family of distributions on the range fibers of the tangent groupoid that is homogeneous for the +×-action modulo smooth functions. Moreover, we show that the basic properties of pseudodifferential operators can be proven directly from this characterization. Further, with the appropriate generalization of the tangent bundle, the same definition applies without change to define pseudodifferential calculi on arbitrary filtered manifolds, in particular the Heisenberg calculus.

Award Identifier / Grant number: ANR-14-CE25-0012-01

Funding statement: Robert Yuncken was supported by the project SINGSTAR of the Agence Nationale de la Recherche, ANR-14-CE25-0012-01.

Acknowledgements

The present article was inspired by an observation of Debord and Skandalis in their paper [11] that provides the first abstract characterization of the classical pseudodifferential operators in terms of the +×-action on the tangent groupoid. We wish to thank them for many discussions, particularly during the time that the first author was Professor Invité at the Université Blaise Pascal, Clermont-Ferrand II. Sincere thanks also go to Jean-Marie Lescure and Nigel Higson.

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Received: 2016-05-25
Revised: 2017-07-26
Published Online: 2017-09-07
Published in Print: 2019-11-01

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