Chern character for twisted K-theory of orbifolds

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Abstract

For an orbifold X and α ∈ H3 (X, Z), we introduce the twisted cohomology Hc* (X, α) and prove that the non-commutative Chern character of Connes-Karoubi establishes an isomorphism between the twisted K-groups Kα* (X) ⊗ C and the twisted cohomology Hc* (X, α). This theorem, on the one hand, generalizes a classical result of Baum-Connes, Brylinski-Nistor, and others, that if X is an orbifold then the Chern character establishes an isomorphism between the K-groups of X tensored with C, and the compactly-supported cohomology of the inertia orbifold. On the other hand, it also generalizes a recent result of Adem-Ruan regarding the Chern character isomorphism of twisted orbifold K-theory when the orbifold is a global quotient by a finite group and the twist is a special torsion class, as well as Mathai-Stevenson's theorem regarding the Chern character isomorphism of twisted K-theory of a compact manifold. © 2005 Elsevier Inc. All rights reserved.

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APA

Tu, J. L., & Xu, P. (2006). Chern character for twisted K-theory of orbifolds. Advances in Mathematics, 207(2), 455–483. https://doi.org/10.1016/j.aim.2005.12.001

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