Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.296..721m&link_type=abstract
Nature, vol. 296, Apr. 22, 1982, p. 721-723.
Astronomy and Astrophysics
Astronomy
22
Astronomical Models, Galactic Evolution, Neutrinos, Adiabatic Conditions, Computerized Simulation, Cosmology, Halos
Scientific paper
A numerical simulation of the clustering of collisionless particles in an early universe where the free streaming of collisionless neutrinos damps out perturbations of an order lower than tens of Mpc in length has led to the formulation of a cell structure with large voids. A numerical simulation is presented which shows that if the initial perturbations are sufficiently isotropic, the collapse of very large collisionless particle perturbations leads to a condensation of particles with low velocity dispersion and high phase-space density, which may easily fragment. The simulation addresses the fact that, although many observations support the existence of the cell structure on the scale of tens of Mpc, the collapse of perturbations of this size leads to velocities on the order of 1000 km/sec. Since neutrinos cannot cool, this figure is too large for their inclusion in galactic haloes with their much smaller velocity dispersions.
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