Origin of hyperdiffusion in generalized Brownian motion

We study a minimal non-Markovian model of superdiffusion which originates from long-range velocity correlations within the generalized Langevin equation (GLE) approach. The model allows for a three-dimensional Markovian embedding. The emergence of a transient hyperdiffusion, $< \Delta x^2(t)> \propto t^{2+\lambda}$,with$\lambda\sim 1-3$ is detected in tilted washboard potentials before it ends up in a ballistic asymptotic regime. We relate this phenomenon to a transient heating of particles $T_{\rm kin}(t)\propto t^\lambda$fromthethermalbathtemperature$T$ to some maximal kinetic temperature $T_{\mathrm{m}\mathrm{a}\mathrm{x}}$. This hyperdiffusive transient regime ceases when the particles arrive at the maximal kinetic temperature.