Silting reduction and Calabi--Yau reduction of triangulated categories

Osamu Iyama, Dong Yang

Published 2014-08-12, updated 2014-12-28Version 2

It is shown that the silting reduction $\ct/\thick\cp$ of a triangulated category $\ct$ with respect to a presilting subcategory $\cp$ can be realized as a certain subfactor category of $\ct$, and that there is a one-to-one correspondence between the set of (pre)silting subcategories of $\ct$ containing $\cp$ and the set of (pre)silting subcategories of $\ct/\thick\cp$. This is analogous to a result for Calabi--Yau reduction. This result is applied to show that Amiot--Guo--Keller's construction of $d$-Calabi--Yau triangulated categories with $d$-cluster-tilting objects takes silting reduction to Calabi--Yau reduction, and conversely, Calabi--Yau reduction lifts to silting reduction.