The real form $EO(2)$ of ER-theory (i.e. real oriented Morava E-theory) is oriented by Spin structure combined with w4-structure, hence by trivialization of the Stiefel-Whitney classes $w_1$, $w_2$ and $w_4$. (Kriz-Sati 04, section 5.2, esp. p. 29).

**partition functions in quantum field theory as indices/genera/orientations in generalized cohomology theory**:

- Igor Kriz, Hisham Sati,
*M Theory, Type IIA Superstrings, and Elliptic Cohomology*, Adv.Theor.Math.Phys. 8 (2004) 345-395 (arXiv:hep-th/0404013)

Created on October 27, 2014 at 17:48:41. See the history of this page for a list of all contributions to it.