  Resonant activation is an effect of a noise-induced escape over a modulated
potential barrier. The modulation of a energy landscape facilitates the escape
kinetics and makes it optimal as measured by the mean first passage time. A
canonical example of resonant activation is a Brownian particle moving in a
time-dependent potential under action of Gaussian white noise. Resonant
activation is observed not only in typical Markovian-Gaussian systems but also
in far from equilibrium and far from Markovianity regimes. We demonstrate that
using an alternative to the mean first passage time, robust measures of
resonant activation, the signature of this effect can be observed in general
continuous time random walks in modulated potentials even in situations when
the mean first passage time diverges.
