Statistics – Computation
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.7901w&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #79.01; Bulletin of the American Astronomical Society, Vol. 24, p.1247
Statistics
Computation
Scientific paper
We have used our highly optimized N-body treecode on the Intel Touchstone Delta supercomputer to perform large simulations of structure formation in a cold dark matter (CDM) Universe. A typical simulation of 17.2 times 10(6) particles for 600 timesteps requires 4.4 times 10(14) floating point operations and takes 24 hours on the 512 processor Intel Delta. The computational volume is a spherical fragment of an Omega =1, h=0.5 Universe with a diameter from 100 to 250 Mpc, which results in a mass resolution of between 2.0 times 10(9) M_sun and 3.3 times 10(10) M_sun, depending on the particular simulation. There are typically O(10(4)) halos in each simulation, with 10(2) to 10(5) particles each. We use a relatively small softening length of 20 kpc. We directly identify galaxy halos as collapsed objects with an overdensity exceeding 200 at z=0, thereby avoiding the approximations used in locating halos inherent with earlier investigations. This unprecedented resolution allows us to study correlations, velocities, and large scale flows as well as distribution patterns of the collapsed objects which are obvious candidates for galactic halos. We find the most significant discrepancy between the standard biased CDM predictions and the simulations is the radial velocity dispersion between halos. In our simulations it is approximately 1200 km/s on scales of 1 Mpc.
Quinn Peter J.
Salmon John K.
Warren Michael S.
Zurek Wojciech Hubert
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