Derived equivalences of triangular matrix rings arising from extensions of tilting modules

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A triangular matrix ring A is defined by a triplet (R,S,M) where R and S are rings and M is an S-R-bimodule. In the main theorem of this paper we show that if T is a tilting S-module, then under certain homological conditions on M as an S-module, one can extend T to a tilting complex over A inducing a derived equivalence between A and another triangular matrix ring specified by (S',R,M'), where the ring S' and the R-S'-bimodule M' depend only on T and M, and S' is derived equivalent to S. Note that no conditions on the ring R are needed. These conditions are satisfied when S is an Artin algebra of finite global dimension and M is finitely generated as an S-module. In this case, (S',R,M')=(S,R,DM) where D is the duality on the category of finitely generated S-modules. They are also satisfied when S is arbitrary, M has a finite projective resolution as an S-module, and ⁿₛ(M,S)=0 for all n>0. In this case, (S',R,M')=(S,R,ₛ(M,S)).