For single-axion potentials of the form Λ0^3 b + Λ1^4 cos(b/fb), the paper classifies the fixed points of the Friedmann-Klein-Gordon dynamics into stable nodes/spirals, saddles, and a bifurcation at |γ/δ|=1.
Constructing dark energy models with late time de Sitter attractor
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abstract
In this paper, we describe a way to construct a class of dark energy models that admit late time de Sitter attractor solution. In the canonical scalar and Born-Infeld scalar dark energy models, we show mathematically that a simple sufficient condition for the existence of a late time de Sitter like attractor solution is that the potentials of the scalar field have non-vanishing minimum while this condition becomes that the potentials have non-vanishing maximum for the phantom models. These attractor solutions correspond to an equation of state $w=-1$ and a cosmic density parameter $\Omega_{\phi}=1$, which are important features for a dark energy model that can meet the current observations.
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Dynamical-System analysis of single-axion monodromy inflation with periodically-modulated potentials
For single-axion potentials of the form Λ0^3 b + Λ1^4 cos(b/fb), the paper classifies the fixed points of the Friedmann-Klein-Gordon dynamics into stable nodes/spirals, saddles, and a bifurcation at |γ/δ|=1.