A Gigaparticle/Gigaparsec Simulation Using the Tree-Particle-Mesh Method

Details A Gigaparticle/Gigaparsec Simulation Using the Tree-Particle-Mesh Method A Gigaparticle/Gigaparsec Simulation Using the Tree-Particle-Mesh Method

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.1301b&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #13.01; Bulletin of the American Astronomical Society, Vol. 31, p.1392

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Using an improved Tree-Particle-Mesh (TPM) code and a powerful supercomputer we have simulated the formation of large-scale structure in a gigaparsec box containing a billion particles. The TPM algorithm (G. Xu 1995, ApJS 98 355) combines the PM method on large scales with a tree code which handles the particle-particle interactions at small separations. After the global PM forces are calculated, spatially distinct regions above a given density threshold are located; the tree code calculates the gravitational interactions inside these dense halos. Since distinct high-density regions are each treated in isolation, this algorithm is naturally parallel. Running on a 256 processor SGI Origin 2000 at NCSA, we simulated the growth of structure in an LCDM model with a particle mass of 7.75*E10 Msun/h and a softening length of 13.5 kpc/h, for a maximum spatial dynamic range of 70,000. The large volume reduces cosmic variance and yields a statistically meaningful sample of clusters of galaxies (especially at high redshift) to facilitate comparisons with the observed evolution of rich clusters, which provides a powerful constraint on cosmological parameters. This work was carried out as part of GC3, the Grand Challenge Cosmology Consortium.

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