tCG Torsion Pairs

Abstract

We investigate conditions for when the $t$-structure of Happel-Reiten-Smalø associated to a torsion pair is a compactly generated $t$-structure. The concept of a $t$CG torsion pair is introduced and for any ring $R$, we prove that $\mathbf{t}=(\mathcal{T},\mathcal{F})$ is a $t$CG torsion pair in $R\text{-Mod}$ if, and only if, there exists, $\{T_{\lambda }\}$ a set of finitely presented $R$-modules in $\mathcal{T}$, such that $\mathcal{F}=\bigcap \text{Ker}({\text{Hom}}_R(T_{\lambda },?))$. We also show that every $t$CG torsion pair is of finite type, and show that the reciprocal is not true. Finally, we give a precise description of the $t$CG torsion pairs over Noetherian rings and von Neumman regular rings.

Made minor corrections to the preliminares and terminology section. Added hyperlinks to the document. To appear in Journal of Algebra and its Applications

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