Abstract
The structure and evolution of the outskirts of clusters in several gravitational instability scenarios are studied. By means of the Hoffman-Ribak constrained random field code we generate realizations of fluctuation fields containing protoclusters of a specified height and shape. The samples generated consist of 64 3 particles in a box with a size of 50 h -1 Mpc. By means of a P 3 M N-body code, using a 128 3 grid, the evolution of the resulting particle distribution is followed into the nonlinear regime. The protoclusters are 3σ 0 fluctuations [σ 0 =σ 0 (4 h -1 Mpc)] in a cold dark matter scenario and in two scale-free scenarios [P(k)∞k n , n=0 or -2], Ω 0 =1
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