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Abstract
In this paper we produce several new invariants for CR and contact manifolds by looking at the noncommutative residue traces of various geometric ΨHDO projections. In the CR setting these operators arise from the 
-complex and include the Szegö projections acting on forms. In the contact setting they stem from the generalized Szegö projections at arbitrary integer levels of Epstein-Melrose and from the contact complex of Rumin. In particular, we recover and extend recent results of Hirachi and Boutet de Monvel and we answer a question of Fefferman.
Received: 2006-06-20
Revised: 2006-12-05
Published Online: 2008-02-05
Published in Print: 2008-1-1
© Walter de Gruyter
