Dokument

Zusammenfassung:
Auf einer Riemannschen Spin-Mannigfaltigkeit mit antisymmetrischer paralleler Torsion geben wir mit Hilfe des Twistor-Operators eine Eigenwertabschätzung des Dirac-Operators mit Torsion. Den Gleichheitsfall der Abschätzung untersuchen wir in den Dimensionen vier und sechs. In ungeraden Dimensionen beschreiben wir Sasaki-Mannigfaltigkeiten, auf denen die Gleichheit in der Abschätzung durch Killing-Spinoren mit Torsion realisiert wird. In Dimension fünf geben wir eine Charakterisierung aller Killing-Spinoren mit Torsion, die auf gewisse natürlich-reduktive Räume als Ausnahmefälle führt.

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