Abstract
La vitesse d'une enveloppe entourant une perturbation de densite spherique avec une sur-densite fractionnaire moyenne Δρ/ρ, dans un univers de Friedmann, peut etre developpee en puissance de Δρ/ρ. En considerant que v est la vitesse d'une enveloppe non-perturbee de meme rayon, le changement de vitesse fractionnaire de l'enveloppe perturbee est donnee par Δv/v -1/3×f 1 (Ω)×(Δρ/ρ) + 4/63×f 2 (Ω)×(Δρ/ρ) 2 + O(Δρ/ρ) 3 . Les coefficients f 1 (Ω) et f 2 (Ω) sont determines pour Ω 1.
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