Figure 8: (a) illustrates the time dependence of the solutions of (32) for a representative choice of parameters. The oscillatory behaviour at early times represents the adiabatic initial condition. At the effective frequency (33) varies nonadiabatically and the fluctuations get a “kick”. (b) plots the occupation number (35) for the same mode. No particles are present in the adiabatic in-going regime. This figure illustrates how the violations of adiabaticity at lead to production of particles.
