Cohomological invariants of root stacks and admissible double coverings
arXiv:2009.07671
Abstract
We give a formula for the cohomological invariants of a root stack, which we apply to compute the cohomological invariants and the Brauer group of the stack of admissible double coverings.
17 pages, comments welcome! New version: changed to allow for coefficients in a general cycle module, as in arxiv:2002.11065