The radial orbit instability in a Universe with Hubble expansion

D. D. CARPINTERO; J. C. MUZZIO

México D. F.

Congreso; First UNAM–Cray Supercomputing Conference; 1993

Instituto de Astronomía - UNAM - México

We investigate the fate of the radial orbit instability in the formation of galactic halos through disipationaless collapse. We present numerical simulations where both the Hubble expansion and the inhomogeneities of the protogalactic material have been taken into account. We find that the radial orbit instability is a transient effect for a wide variety of initial conditions, including those with cosmological-like density fluctuations.