English

Model structures arising from weak cotorsion pairs

Representation Theory 2026-07-19 v1

Abstract

Let A\mathcal{A} be an abelian category. Beligiannis and Reiten proved that there is a bijective correspondence between so-called projective model structures on A\mathcal{A} and hereditary cotorsion pairs in A\mathcal{A} with a contravariantly finite core. It is well-known that, tilting modules induce cotorsion pairs, so we may have a homotopicl interpretation of tilting modules. But a recent generalization of tilting modules, support τ\tau-tilting modules, induce weak cotorsion pairs. In this paper, we define weak projective model structures and prove that there is a bijective correspondence between weak projective model structures and left weak cotorsion pairs satisfying some mild conditions. This is a generalization of Beligiannis-Reiten correspondence from the perspective and philosophy of τ\tau-tilting theory. In particular, we prove that any support τ\tau-tilting module induce a model structure, and there is bijective correspondence between support τ\tau-tilting modules and a certain class of model structures.

Cite

@article{arxiv.2607.17322,
  title  = {Model structures arising from weak cotorsion pairs},
  author = {Ramin Ebrahimi and Rasool Hafezi and Jiaqun Wei},
  journal= {arXiv preprint arXiv:2607.17322},
  year   = {2026}
}

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