Light-mass Galileon models with cubic interactions and three tested potentials have no stable late-time accelerating attractors in phase space, unlike quintessence which has stable de-Sitter attractors for cosh potentials.
Dynamical system analysis in descending dark energy model
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In this paper, we study the dynamical system analysis for a recently proposed decaying dark energy model, namely, Q-SC-CDM. First we investigate the stationary points to find the stable attractor solution under the conditions discussed recently in the literature. In this case, we do not find any stable attractor solution. Therefore, we avoid the parameter space of Q-SC-CDM model discussed in arXiv:2201.07704. Second, we make different choice for the model parameters and re-investigate the stationary points and their stability. Our analysis shows that a simple choice of model parameters allows to capture a stable attractor solution. Moreover, we obtain phase portrait where all trajectories move towards the stable attractor point.
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Galileon versus Quintessence: A comparative phase space analysis and late-time cosmic relevance
Light-mass Galileon models with cubic interactions and three tested potentials have no stable late-time accelerating attractors in phase space, unlike quintessence which has stable de-Sitter attractors for cosh potentials.