Simulating Large Scale Structure: the Effect of Increasing Particle Impulse on Void Probability

Details Simulating Large Scale Structure: the Effect of Increasing Particle Impulse on Void Probability Simulating Large Scale Structure: the Effect of Increasing Particle Impulse on Void Probability

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5502b&link_type=abstract

American Astronomical Society, AAS Meeting #211, #55.02; Bulletin of the American Astronomical Society, Vol. 39, p.826

Astronomy and Astrophysics

Astronomy

Scientific paper

Astronomers are growing the number of measurements describing in detail the organization of matter on the largest scales. Such measurements have been carried out by NASA's Wilkinson Microwave Anisotropy Probe (WMAP) mission which conducted an all-sky survey, revealing low-amplitude (1 part in 104) anisotropies which crisscross the early universe, z=1000, in spatially-extensive ripples. The Sloan Digital Sky Survey (SDSS) revealed that the universe, out to z=0.3, is dominated by countless clusters, each containing thousands of galaxies stretched in filaments surrounding enormous voids of apparently empty space. To study what came between these extremes, a temporal gap of 10 billion years, we are simulating the evolution of the clustering of baryonic matter influenced by gravitational interactions overwhelming dominated by cold dark matter. Our simulations are propagated on at least 16-processors of a parallel computer, and they calculate the interactions of a smoothed-hydrodynamic self-gravitating collisionless dual-fluid N-body system, where N > 1 million, using the Gadget 2 code. We present results from simulations in which we progressively increase the magnitude of the near-particle impulse in the interactions with a focus on void formation. We compare measurements of the large scale structure of the simulated universes to those of the real universe and to predictions from theoretical models. We find a natural distribution of small voids similar to observations but fail to reproduce the large observed voids. Simulations with large impulse result in void probabilities most like those derived from observation. Among theoretical models, the virialized-thermodynamic provides a good match to simulations, at least around small voids. This suggests that the simulated universes may be approaching thermal equilibrium, and we fit the velocity distribution with a Maxwell-Boltzmann function to derive a kinetic temperature for both the baryonic and dark matter.
We thank the Kentucky Space Grant Consortium for funding this research.

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