English

Balanced pairs, virtually Gorenstein rings, and cotorsion torsion triples

Representation Theory 2026-02-24 v1 Commutative Algebra Rings and Algebras

Abstract

For any ring RR, we investigate balanced pairs of classes of modules and their relations to cotorsion triples. We characterize the case when a balanced pair generates a tilting cotorsion pair, and dually, when it cogenerates a cotilting cotorsion pair. If RR is right noetherian, we prove that the pair consisting of Gorenstein projective modules and Gorenstein injective modules is balanced if and only if RR is right virtually Gorenstein. In [4], cotorsion torsion triples in abelian categories were employed in the representation theory of rectangular grids occurring in persistent homology theory. For module categories, we use infinite dimensional tilting theory to completely classify all cotorsion torsion triples by means of 11-resolving subcategories of \rfmodR\rfmod R, and to give an explicit 1-1 correspondence between the formally dual notions of cotorsion torsion triples of right RR-modules and torsion cotorsion triples of left RR-modules. This correspondence is bijective in case the underlying ring RR is left noetherian, but not in general.

Keywords

Cite

@article{arxiv.2602.18818,
  title  = {Balanced pairs, virtually Gorenstein rings, and cotorsion torsion triples},
  author = {Sergio Estrada and Jiangsheng Hu and Jan Trlifaj},
  journal= {arXiv preprint arXiv:2602.18818},
  year   = {2026}
}

Comments

20 pages