Abstract
In the first part my purpose is to find existence conditions for a spin structure on a manifold in a purely differential geometric scope, without the machinery of the algebraic topology and avoiding systematically any matricial formalism.
A spin structure can be considered as aG-structure (using a classical terminology). Groups, called by myself “groups of spinoriality” play an essential part in this problem. We study them with a few details in the second part of chapter I.
The second part is devoted to introduce the notion of twistors, generalizing studies already made in particular cases. Twistorial fibrations naturally go with spin fibrations.
Broadly, twistors of order 2 are for the conformal group of signature (p, q), that are spinors for the group of isometry of signature (p+1,q+1).
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Crumeyrolle, A. Fibrations spinorielles et twisteurs généralisés. Period Math Hung 6, 143–171 (1975). https://doi.org/10.1007/BF02018816
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DOI: https://doi.org/10.1007/BF02018816