Filtrations in abelian categories with a tilting object of homological dimension two

Details Filtrations in abelian categories with a tilting object of homological dimension two Filtrations in abelian categories with a tilting object of homological dimension two

2010-07-20

arxiv.org/abs/1007.3428v1

Mathematics

Representation Theory

Scientific paper

We consider filtrations of objects in an abelian category $\catA$ induced by a tilting object $T$ of homological dimension at most two. We define three disjoint subcategories with no maps between them in one direction, such that each object has a unique filtation with factors in these categories. This filtration coincides with the the classical two-step filtration induced by torsion pairs in dimension one. We also give a refined filtration, using the derived equivalence between the derived categories of $\catA$ and the module category of $End_\catA (T)^{op}$. The factors of this filtration consist of kernel and cokernels of maps between objects which are quasi-isomorphic to shifts of $End_\catA (T)^{op}$-modules via the derived equivalence $\mathbb{R}Hom_\catA(T,-)$.

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