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The Role of Spin(9) in Octonionic Geometry
Version 1
: Received: 20 September 2018 / Approved: 21 September 2018 / Online: 21 September 2018 (06:07:27 CEST)
A peer-reviewed article of this Preprint also exists.
Parton, M.; Piccinni, P. The Role of Spin(9) in Octonionic Geometry. Axioms 2018, 7, 72. Parton, M.; Piccinni, P. The Role of Spin(9) in Octonionic Geometry. Axioms 2018, 7, 72.
Abstract
Starting from Thomas Friedrich’s work “Weak Spin(9) structures on 16-dimensional Riemannian manifolds”, we review several interactions between Spin(9) and geometries related to octonions. Several topics are discussed in this respect: explicit descriptions of the Spin(9) canonical 8-form and its analogies with quaternionic geometry, the role of Spin(9) both in the classical problems of vector fields on spheres and in the geometry of the octonionic Hopf fibration. Next, we deal with locally conformally parallel Spin(9) manifolds in the framework of intrinsic torsion. Finally, we discuss applications of Clifford systems and Clifford structures to Cayley-Rosenfeld planes and to three series of Grassmannians.
Keywords
Spin(9); octonions; vector fields on spheres; Hopf fibration; locally conformally parallel; Clifford structure; Clifford system; symmetric spaces
Subject
Computer Science and Mathematics, Geometry and Topology
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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