Interaction between Dark Matter and Dark Energy and the Cosmological Coincidence Problem

Figure 7

(a) The phase plane for the critical with , , , and . The critical point is a stable node (a sink) so that the quintessence dominated solution is the future attractor. The critical points and are saddle points. (b) The phase plane for the critical points with , , , and . The critical points are stable nodes (sinks) so that the quintessence dominated solution is the late time attractor. The critical points and are saddle points.

(a)

(b)