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

Table 1

Properties of the critical points.

Point	Existence	Stability
	,	Saddle point if and ,; unstable node if and	1	1	No
	,	Saddle point if and ,; unstable node if and	1	1	No
	,	Stable node if and ,; saddle point if	1
	,	Saddle point if	0
		Stable node for left panel of Figure 1; Stable spiral for right panel of Figure 1