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Title: Global operator calculus on spin groups
Author: Cerejeiras, P.
Ferreira, M.
Kähler, U.
Wirth, J.
Keywords: Spin group
Spin representations
Difference operators
Pseudo-differential operators
Fourier transform
Microlocal analysis
Elliptic operators
Global hypoellipticity
Issue Date: 2023
Publisher: Springer
Abstract: In this paper, we use the representation theory of the group Spin(m) to develop aspects of the global symbolic calculus of pseudo-differential operators on Spin(3) and Spin(4) in the sense of Ruzhansky–Turunen–Wirth. A detailed study of Spin(3) and Spin(4)-representations is made including recurrence relations and natural differential operators acting on matrix coefficients. We establish the calculus of left-invariant differential operators and of difference operators on the group Spin(4) and apply this to give criteria for the subellipticity and the global hypoellipticity of pseudo-differential operators in terms of their matrix-valued full symbols. Several examples of first and second order globally hypoelliptic differential operators are given, including some that are locally neither invertible nor hypoelliptic. The paper presents a particular case study for higher dimensional spin groups.
Peer review: yes
DOI: 10.1007/s00041-023-10015-5
ISSN: 1069-5869
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Appears in Collections:CIDMA - Artigos
CHAG - Artigos

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