From Quantum Unstable Systems to the Decaying Dark Energy: Cosmological Implications

Figure 1

The phase portrait of system (39). Critical point 1 is the stable node and critical point 2 is the saddle. These critical points represent the de Sitter universes. Here, is the present value of the Hubble function. The value of is assumed as . Note that the phase portrait is not symmetric under reflection . While critical point 1 is a global attractor, only a unique separatrix reaches critical point 2.