Subspace-hypercyclic conditional type operators on $L^p$-spaces

TL;DR

This paper investigates the conditions under which certain conditional weighted composition operators on $L^p$-spaces exhibit subspace-hypercyclicity, including necessary and sufficient criteria, and explores related mixing properties.

Contribution

It provides new necessary and sufficient conditions for subspace-hypercyclicity of these operators, extending the understanding of their dynamic behavior on $L^p$-spaces.

Findings

Periodic nonsingular transformations imply no hypercyclicity.

Necessary conditions involve non-singular, finitely non-mixing transformations.

Normality of the transformation ensures subspace-hypercyclicity.

Abstract

A conditional weighted composition operator $T_u: L^p(\Sigma)\rightarrow L^p(\mathcal{A})$ ($1\leq p<\infty$), is defined by $T_u(f):= E^{\mathcal{A}}(u f\circ \varphi)$, where $\varphi: X\rightarrow X$ is a measurable transformation, $u$ is a weight function on $X$ and $E^{\mathcal{A}}$ is the conditional expectation operator with respect to $\mathcal{A}$. In this paper, we study the subspace-hypercyclicity of $T_u$ with respect to $L^p(\mathcal{A})$. First, we show that if $\varphi$ is a periodic nonsingular transformation, then $T_u$ is not $L^p(\mathcal{A})$-hypercyclic. The necessary conditions for the subspace-hypercyclicity of $T_u$ are obtained when $\varphi$ is non-singular and finitely non-mixing. For the sufficient conditions, the normality of $\varphi$ is required. The subspace-weakly mixing and subspace-topologically mixing concepts are also studied for $T_u$. Finally, we give an example which is subspace-hypercyclic while is not hypercyclic.