  We present numerical N-body simulation studies of large-scale structure
formation. The main purpose of these studies is to analyze the several models
of dark matter and the role they played in the process of large-scale structure
formation. We analyze in this work a flat cold dark matter dominated model
known as the Santa Barbara cluster. We compare the results for this model using
the standard Newtonian limit of general relativity with the corresponding
results of using the Newtonian limit of scalar-tensor theories. An specific
model is the one that considers that the scalar field is non-minimally coupled
to the Ricci scalar in the Einstein-Hilbert Lagrangian. Comparisons of the
models are done showing results of rotation curves, density profiles, and
velocity dispersions for halos formed at z=0. We analyze, in particular, the
Santa Barbara cluster and its possible equation of state.
