The motive of the classifying stack of the orthogonal group
arXiv:1411.2710
Abstract
We compute the motive of the classifying stack of an orthogonal group in the Grothendieck ring of stacks over a field of characteristic different from two.
arXiv comment8 pages. Added references in v2. Fixed typo in Corollary 3.8 in v3, which now matches published version