Stochastic dynamics of two-step processes with harmonic potential
  In this paper we address the one-dimensional problem of stochastic renewal in different damping environments. An ensemble of particles with some specified initial distribution in phase space are allowed to evolve stochastically till a certain instant of time (say,$tau$), when a restoring force is applied to bring them back to some point in configuration space. The physical quantities of interest that have been studied are the Survival Probability and the First Passage distribution for return to the specified target point. We observe nontrivial dependence of these quantities on $tau$ as well as on the width of the initial distribution, which has been taken to be Gaussian in position and velocity. 
Jyotipriya Roy, Chitrak Bhadra, Debapriya Das, Dhruba Banerjee, Deb   Shankar Ray
cond-mat.stat-mech