Discrepancies of \(p\)-cyclic quotient varieties. (English) Zbl 1441.14019
Summary: We consider the quotient variety associated to a linear representation of the cyclic group of order \(p\) in characteristic \(p>0\). We estimate the minimal discrepancy of exceptional divisors over the singular locus. In particular, we give criteria for the quotient variety being terminal, canonical and log canonical. As an application, we obtain new examples of non-Cohen-Macaulay terminal singularities, adding to examples recently announced by Totaro.
MSC:
14B05 | Singularities in algebraic geometry |
14E30 | Minimal model program (Mori theory, extremal rays) |
14E16 | McKay correspondence |
14E18 | Arcs and motivic integration |