Communications in Analysis and Geometry

Volume 19 (2011)

Number 2

The odd Chern character and index localization formulae

Pages: 209 – 276



Daniel Cibotaru (Instituto de Matemática e Estatística, Universidade Federal Fluminense, Brazil)


We describe geometric representatives for the generatorsof the cohomology ring of a model of the classifying spacefor the functor $K^{-1}$. The class corresponding to thedegree one generator is closely related to the spectralflow of a one-parameter family of self-adjoint, Fredholmoperators. We use intersection theory to derivelocalization formulae that express the cohomological indexof a higher dimensional family of such operators as thePoincare dual of an explicit $0$-cycle in the parameterspace. We derive, under certain conditions, an equalitythat relates the cohomological index to the variation ofthe family of kernels.

Published 2 September 2011