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We investigate the evolution of matter density perturbations in a universe with a cosmological term that decreases with time as {Λ}{∝}a^-m. For fixed values of Ωₘ₀ the power spectrum is constructed and we show that it is only slightly modified when the parameter m is changed from m=0 to m=2. Some properties concerning the peculiar velocity field are also discussed.
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Silveira et al. (1994) studied this question.
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