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Gravitational Clustering in an Expanding Universe: text

Initial Power Spectrum P(k) is constant

Different cold dark matter models were tested for their ability to form large-scale structures through gravity alone. The frame represents a spatial scale millions of light-years across. Filaments visible in both movies resemble giant galaxy superclusters or sheets observed at similar scales. Billions of years of evolution are traversed in these animations, spanning 1 million years after the Big Bang to present day.

The two simulations presented here differ only in their starting conditions denoted by the "Initial Power Spectrum." Low density regions where no galaxies would form are black. Increasing matter density is shaded into blue, yellow, then green.

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Copyright, (c) 1995: Board of Trustees, University of Illinois

NCSA. Last modified, 10/11/95