Time Reparametrization and Chaotic Dynamics in Conformable $C_0$-Semigroups

TL;DR

This paper shows that conformable derivatives lead to a reparametrization of classical $C_0$-semigroups through a nonlinear clock, revealing which dynamical behaviors are genuinely new or inherited from classical models.

Contribution

It establishes a systematic operator-theoretic framework linking conformable semigroups to classical ones via a nonlinear time change, clarifying their dynamical properties.

Findings

Conformable semigroups are equivalent to classical semigroups observed through a nonlinear clock.

$ ext{alpha}$-hypercyclicity and chaos are preserved under conformable reparametrization.

A conformable spectral criterion for chaos is derived.

Abstract

Conformable derivatives provide a fractional-looking calculus that remains local and admits a simple representation through classical derivatives with explicit weights. In this paper we develop a systematic operator-theoretic perspective showing that conformable time evolution is, in essence, a classical $C_0$-semigroup observed through a nonlinear clock. We introduce the conformable time map $\psi(t)=t^\alpha/\alpha$ and prove that every $C_0$--$\alpha$-semigroup $\{T_\alpha(t)\}_{t\ge0}$ can be written as $T_\alpha(t)=T(\psi(t))$ for a uniquely determined classical $C_0$-semigroup $\{T(s)\}_{s\ge0}$, with generators agreeing on a common domain. This correspondence yields a one-to-one transfer of mild solutions and shows that orbit-based linear dynamics are invariant under conformable reparametrization. In particular, $\alpha$-hypercyclicity and $\alpha$--chaos coincide with the usual notions for the associated classical semigroup. As a consequence, we obtain a conformable version of the Desch--Schappacher--Webb spectral criterion for chaos. We also place the analysis in the natural functional setting provided by conformable Lebesgue spaces $L^{p,\alpha}$ and their explicit isometric identification with standard $L^p$ spaces, which allows one to transport estimates and spectral arguments without loss. The results clarify which dynamical phenomena in conformable models are genuinely new and which are inherited from classical semigroup dynamics via a nonlinear change of time.