Including matter perturbations makes the (c) fixed point of coupled quintessence a saddle rather than a late-time attractor for observationally allowed λ, leaving (a1)→(b)→(d) as the viable cosmic sequence.
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Cosmological perturbations and dynamical analysis for interacting quintessence
Including matter perturbations makes the (c) fixed point of coupled quintessence a saddle rather than a late-time attractor for observationally allowed λ, leaving (a1)→(b)→(d) as the viable cosmic sequence.