Fig. 6
Evolution of the perturbation δ(a) in a BEC universe with attractive quartic self-interaction in the TF limit (γ = 2, as < 0). We have numerically solved Eq. (57) with κQ → + ∞ and κJ → iκJ, with the initial condition ai = 0.1, δ(ai) = 10-5 and δ′(ai) = 0. From bottom to top: k/κJ = 0.2,0.4,0.6,0.8,1. The lowest curve corresponds to a cold classical gas.
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