Gentle algebras arising from surfaces with orbifold points, Part II: Locally free Caldero-Chapoton functions

Abstract: We categorify a class of skew-symmetrizable cluster algebras associated to orbifolds using locally free representations of the gentle algebras arising from orbifold triangulations. Along the way, we generalize Derksen-Weyman-Zelevinsky's mutation on representations of quivers with potentials to these gentle algebras and study the relation with $\tau$-tilting theory. A Caldero-Chapton type formula concerning locally free sub-representations is proven for cluster variables.