Pilca, Mihaela (2011) A new proof of Branson's classification of elliptic generalized gradients. MANUSCRIPTA MATHEMATICA, 136 (1-2). pp. 65-81. ISSN 0025-2611,
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We give a representation theoretical proof of Branson's classification (J Funct Anal 151(2):334-383, 1997), of minimal elliptic sums of generalized gradients. The original proof uses tools of harmonic analysis, which as powerful as they are, seem to be specific for the structure groups SO(n) and Spin(n). The different approach we propose is a local one, based on the relationship between ellipticity and optimal Kato constants and on the representation theory of so(n). Optimal Kato constants for elliptic operators were computed by Calderbank et al. (J Funct Anal 173(1):214-255, 2000). We extend their method to all generalized gradients (not necessarily elliptic) and recover Branson's result, up to one special case. The interest of this method is that it is better suited to be applied for classifying elliptic sums of generalized gradients of G-structures, for other subgroups G of the special orthogonal group.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | RIEMANNIAN GEOMETRY; OPERATORS; MANIFOLDS; |
| Subjects: | 500 Science > 510 Mathematics |
| Divisions: | Mathematics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 02 Jun 2020 08:05 |
| Last Modified: | 02 Jun 2020 08:07 |
| URI: | https://pred.uni-regensburg.de/id/eprint/20371 |
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