Singularity categories via McKay quivers with potential

Abstract: In 2018, Kalck and Yang showed that the singularity categories associated with 3-dimensional Gorenstein quotient singularities are triangle equivalent (up to direct summands) to small cluster categories associated with McKay quivers with potential. We introduce graded McKay quivers with potential and generalize Kalck-Yang's theorem to arbitrary dimensions. The singularity categories we consider occur as stable categories of categories of maximal Cohen-Macaulay modules. We refine our description of the singularity categories by showing that these categories of maximal Cohen-Macaulay modules are equivalent to Higgs categories in the sense of Wu. Moreover, we describe the singularity categories in the non-Gorenstein case.