Compatibility of HRS tilt and completion of $t$-structures in triangulated categories

Abstract

Let $K$ be a field, and $\mathcal{T}$ a $K$-linear essentially small triangulated category equipped with an extendable $t$-structure $({\mathcal{T}}^{\le 0},{\mathcal{T}}^{\ge 0})$ with respect to a good metric $\mathfrak{B}$. Given a torsion class $\mathcal{X}$ in the heart of $({\mathcal{T}}^{\le 0},{\mathcal{T}}^{\ge 0})$, we prove that lifting the HRS-tilt of $({\mathcal{T}}^{\le 0},{\mathcal{T}}^{\ge 0})$ at $\mathcal{X}$ along the completion of $\mathcal{T}$ coincides with the HRS-tilt of the lifted $t$-structure at the completion of $\mathcal{X}$. As an application, we provide the compatibility result between left silting mutation in $\mathcal{T}$ and HRS tilting in the ambient completion.