Cluster analysis of the nonlinear evolution of large-scale structure in an axion/gravitino/photino-dominated universe

Statistics – Computation

Scientific paper

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Cluster Analysis, Cosmology, Galactic Evolution, Gravitinos, Covariance, Gravitons, Neutrinos, Nonlinear Systems, Photons

Scientific paper

Computer simulations of the evolution of an adiabatic, massive-neutrino-based (A) universe and a universe based on axions, gravitinos, or photinos (AGP) are discussed. A cloud-in-cell gravitational-clustering code on a 32-cubed mesh and a 'bent' power spectrum are employed in both simulations. Comparison of the two models shows that both A and AGP reproduce clustering behavior acceptably, but AGP alone predicts the onset of galaxy formation at Z greater than about 5. In the AGP universe, galaxy formation results from the collapse of small-scale perturbations, as in classical hierarchical-clustering theory, while large-scale coherent structures form as in the A universe. The AGP model is considered worthy of further investigation using higher-resolution computations.

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