$ρ$-Frequently Hypercyclic Operators

Abstract

The concept of $ρ$-frequent hypercyclicity is introduced in order to provide a refined form of frequent hypercyclicity. This is achieved by replacing the denominator in the definition of frequent hypercyclicity by an appropriately chosen calibration function $ρ$. A $ρ$-Frequent Hypercyclicity Criterion is determined and the $ρ$-frequent hypercyclicity of weighted backward shifts is investigated.