Silting-discrete graded path algebras

Abstract

We classify connected finite acyclic graded quivers $Q$ for which the graded path algebra $kQ$, regarded as a formal dg algebra, is silting-discrete. We prove that $kQ$ is silting-discrete if and only if it is derived-discrete, and that both conditions are equivalent to the underlying graph of $Q$ being of type ADE, or of type $\widetilde{A}$ with unequal clockwise and counter-clockwise total degrees. The key ingredient is an explicit construction of an infinite pre-simple-minded collection in $\\text{pvd } kQ$ in the non-discrete case.