Differential orbifold K-theory

  • Ulrich Bunke

    University of Regensburg, Germany
  • Thomas Schick

    University of Göttingen, Germany


We construct differential K-theory of representable smooth orbifolds as a ring valued functor with the usual properties of a differential extension of a cohomology theory. For proper submersions (with smooth fibres) we construct a push-forward map in differential orbifold K-theory. Finally, we construct a non-degenerate intersection pairing with values in C/Z\mathbb{C}/\mathbb{Z} for the subclass of smooth orbifolds which can be written as global quotients by a finite group action. We construct a real subfunctor of our theory, where the pairing restricts to a non-degenerate R/Z\mathbb{R}/\mathbb{Z}-valued pairing.

Cite this article

Ulrich Bunke, Thomas Schick, Differential orbifold K-theory. J. Noncommut. Geom. 7 (2013), no. 4, pp. 1027–1104

DOI 10.4171/JNCG/143