%0 Journal Article
%T On the algebraic index for riemannian ¨¦tale groupoids
%A M. J. Pflaum
%A H. Posthuma
%A X. Tang
%J Mathematics
%D 2008
%I arXiv
%R 10.1007/s11005-009-0339-y
%X In this paper we construct an explicit quasi-isomorphism to study the cyclic cohomology of a deformation quantization over a riemannian \'etale groupoid. Such a quasi-isomorphism allows us to propose a general algebraic index problem for riemannian \'etale groupoids. We discuss solutions to that index problem when the groupoid is proper or defined by a constant Dirac structure on a 3-dim torus.
%U http://arxiv.org/abs/0812.3975v1