Cosmic infinity: A dynamical system approach
  Dynamical system techniques are extremely useful to study cosmology. It turns out that in most of the cases, we deal with finite isolated fixed points corresponding to a given cosmological epoch. However, it is equally important to analyse the asymptotic behaviour of the universe. On this paper, we show how this can be carried out for 3-forms model. In fact, we show that there are fixed points at infinity mainly by introducing appropriate compactifications and defining a new time variable that washes away any potential divergence of the system. The richness of 3-form models allows us as well to identify normally hyperbolic non-isolated fixed points. 
Mariam Bouhmadi-L\'opez, Jo\~ao Marto, Jo\~ao Morais, C\'esar M. Silva
gr-qc hep-ph hep-th math-ph math.MP