Phase-space analysis of a quadratic dark energy model finds that negative η produces stable phantom attractors while the effective equation of state approaches -1 asymptotically from both sides without crossing.
Quadratic equation of state for cosmic acceleration: Entropy evolution and phantom crossing,
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Quadratic Dark Energy Phase-Space Dynamics and Analysis
Phase-space analysis of a quadratic dark energy model finds that negative η produces stable phantom attractors while the effective equation of state approaches -1 asymptotically from both sides without crossing.