2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/11783Using weakly nonlinear conditional PDF for the density field around an overdense region we find that the expected density contrast around a peak is always smaller while its rms fluctuation larger than in the linear case. We apply these results to the spherical model of collapse as developed by Hoffman & Shaham (1985) and find that in the case of open Universe the effect of weakly nonlinear interactions is to decrease the scale from which a peak gathers mass and the mass itself as well as to steepen the final profile of the virialized protoobject.Contribution to the proceedings of the UC Santa Cruz Workshop on Galactic Halos, August 1997, 3 pages + 1 ps figure, uses paspconf.sty and epsf.styAstrophysicstext