Derived categories of resolutions of cyclic quotient singularities
Derived categories of resolutions of cyclic quotient singularities
复制标题
循环商奇点解析的派生范畴
DOI:
10.1093/qmath/hax048
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
P. Sosna
中科院分区:
文献类型:
--
作者:
Andreas Krug;D. Ploog;P. Sosna
For a cyclic group $G$ acting on a smooth variety $X$ with only one character occurring in the $G$-equivariant decomposition of the normal bundle of the fixed point locus, we study the derived categories of the orbifold $[X/G]$ and the blow-up resolution $\widetilde Y \to X/G$.
Some results generalise known facts about $X = A^n$ with diagonal $G$-action, while other results are new also in this basic case. In particular, if the codimension of the fixed point locus equals $|G|$, we study the induced tensor products under the equivalence $D^b(\widetilde Y) \cong D^b([X/G])$ and give a 'flop-flop=twist' type formula. We also introduce candidates for general constructions of categorical crepant resolutions inside the derived category of a given geometric resolution of singularities and test these candidates on cyclic quotient singularities.
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