Cosmological Dynamics of a Hybrid Chameleon Scenario

Figure 3

The phase space trajectories of the hybrid chameleon model with 𝑚=0.6, 𝑛=0.5, 𝛽=1, and 𝜔=0. This figure is plotted for the case with 𝑢=0. With these values in the parameters space, the critical lines ℒ₁ and ℒ₂ (the solutions corresponding to the quintessence component’s kinetic energy domination) are repellers (and so unstable solutions). The critical point M (the solution with potential energy domination) is a stable attractor.