Relative contravariantly finite subcategories and relative tilting modules

Abstract

Let $A$ be a finite dimensional algebra over an algebraically closed field $k$. Let $T$ be a tilting $A$-module and $B={\mathrm{End}}_{A}T$ be the endomorphism algebra of $T$. In this paper, we consider the correspondence between the tilting $A$-modules and the tilting $B$-modules, and we prove that there is a one-one correspondence between the basic $T$-tilting $A$-modules in $T^{\perp }$ and the basic tilting $B$-modules in ${}^{\perp }(D_{B}T)$. Moreover, we show that there is a one-one correspondence between the $T$-contravariantly finite $T$-resolving subcategories of $T^{\perp }$ and the basic $T$-tilting $A$-modules contained in $T^{\perp }$. As an application, we show that there is a one-one correspondence between the basic tilting $A$-modules in $T^{\perp }$ and the basic tilting $B$-modules in ${}^{\perp }(D_{B}T)$ if $A$ is a $1$-Gorenstein algebra or a $m$-replicated algebra over a finite dimensional hereditary algebra.

21 pages