Mathematics – Differential Geometry
Scientific paper
2004-05-20
Mathematics
Differential Geometry
32page. minor revision including new observations
Scientific paper
We study geometric first order differential operators on quaternionic
K\"ahler manifolds. Their principal symbols are related to the enveloping
algebra and Casimir elements for $\Sp(1)\Sp(n)$. This observation leads to
anti-symmetry of the principal symbols and Bochner-Weitzenb\"ock formulas for
operators. As an application, we estimate the first eigenvalues of them.
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