Figure 2

Landau damping effects in the order parameter R(t) with Lorentzian FD.

Horizontal lines are time, solid lines refer to the numerical solutions of Eq. (1) and dashed lines are the analytical predictions of Eq. (32). The three log-linear plots refer to the cases Δ > 0 (a), Δ = 0 (b), and Δ < 0 (c). All curves belong to the neutrally stable regime of the incoherent state predicted by linear theory. In the numerical simulations, the initial states of the system are set in the fully coherent states.