group cohomology, nonabelian group cohomology, Lie group cohomology
cohomology with constant coefficients / with a local system of coefficients
differential cohomology
Where the Chern character of a map to $\mathbf{B}U$ (for $U$ the stable unitary group) is a sum of characteristic classes corresponding to invariant polynomials, the odd Chern character $ch(g)$ of a map to $g \colon X \to U$ is a sum of the corresponding WZW term curvatures
where $g^{-1}d g \coloneqq g^\ast \theta$ is the pullback of differential forms along $g$ of the Maurer-Cartan form on $U$.
The odd Chern character appears in the index theory for Toeplitz operators and the eta invariant for even-dimensional manifolds (Dai-Zhang 12).
Paul Baum, R. G. Douglas, K-homology and index theory, in Proc. Sympos. Pure
and Appl. Math., Vol. 38, pp. 117-173, Amer. Math. Soc. Providence, 1982.
Ezra Getzler, The odd Chern character in cyclic homology and spectral
flow_, Topology, 32(3):489–507, 1993.
Discussion of the relation to index theory of Toeplitz operators and eta invariants is in
Discussion of odd differential K-theory via the odd Chern character is in
Thomas Tradler, Scott Wilson, Mahmoud Zeinalian, An Elementary Differential Extension of Odd K-theory, J. of K-theory, K-theory and its Applications to Algebra, Geometry, Analysis
and Topology, (arXiv:1211.4477)
Scott Wilson, A loop group extension of the odd Chern character (arXiv:1311.6393)
Created on June 17, 2015 at 12:38:54. See the history of this page for a list of all contributions to it.