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Spineurs, opérateurs de Dirac et variations de métriques. (Spinors, Dirac operators and variations of the metrics). (French) Zbl 0755.53009
The construction of a spinor bundle over a Riemannian spin manifold depends on the given metric. In this article a geometric process to compare spinor fields for different metrics is described. As an application one can study how the eigenvalues of the Dirac operator depend on the metric. A few cases are discussed in which the eigenvalues are critical for arbitrary volume preserving variations of the metric.

MSC:
53C27 Spin and Spin\({}^c\) geometry
58C40 Spectral theory; eigenvalue problems on manifolds
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