Retraction of the bivariant Chern character

Details Retraction of the bivariant Chern character Retraction of the bivariant Chern character

2002-02-12

arxiv.org/abs/math-ph/0202016v2

K-Theory 31 (2004) 233-287

Physics

Mathematical Physics

45 pages

Scientific paper

We show that the bivariant Chern character in entire cyclic cohomology constructed in a previous paper in terms of superconnections and heat kernel regularization, retracts on periodic cocycles under some finite summability conditions. The trick is a bivariant generalization of the Connes-Moscovici method for finitely summable K-cycles. This yields concrete formulas for the Chern character of p-summable quasihomomorphisms and invertible extensions, analogous to those of Nistor. The latter formulation is completely algebraic and based on the universal extensions of Cuntz and Zekri naturally appearing in the description of bivariant K-theory.

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