Cluster tilting for higher Auslander algebras

The concept of cluster tilting gives a higher analogue of classical Auslander correspondence between representation-finite algebras and Auslander algebras. The $n$-Auslander-Reiten translation functor $τ_n$ plays an important role in the study of $n$-cluster tilting subcategories. We study the category $\MM_n$ of preinjective-like modules obtained by applying $τ_n$ to injective modules repeatedly. We call a finite dimensional algebra $Λ$ \emph{$n$-complete} if $\MM_n=\add M$ for an $n$-cluster tilting object $M$. Our main result asserts that the endomorphism algebra $\End_Λ(M)$ is $(n+1)$-complete. This gives an inductive construction of $n$-complete algebras. For example, any representation-finite hereditary algebra $Λ^{(1)}$ is 1-complete. Hence the Auslander algebra $Λ^{(2)}$ of $Λ^{(1)}$ is 2-complete. Moreover, for any $n\ge1$, we have an $n$-complete algebra $Λ^{(n)}$ which has an $n$-cluster tilting object $M^{(n)}$ such that $Λ^{(n+1)}=\End_{Λ^{(n)}}(M^{(n)})$. We give the presentation of $Λ^{(n)}$ by a quiver with relations. We apply our results to construct $n$-cluster tilting subcategories of derived categories of $n$-complete algebras.

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