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The point spectrum of the Dirac operator on noncompact symmetric spaces
Authors:S. Goette   U. Semmelmann
Affiliation:Mathematisches Institut, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany ; Mathematisches Institut, Universität München, Theresienstr.~39, D-80333 München, Germany
Abstract:In this note, we consider the Dirac operator $D$on a Riemannian symmetric space $M$ of noncompact type. Using representation theory, we show that $D$has point spectrum iff the ${hat A}$-genus of its compact dual does not vanish. In this case, if $M$ is irreducible, then $M=mathrm{U}(p,q)/mathrm{U}(p)times mathrm{U}(q)$ with $p+q$ odd, and  $operatorname{Spec}_{p}(D)={0}$.

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