Under-Density Regions and the Primordial Density Field

Details Under-Density Regions and the Primordial Density Field Under-Density Regions and the Primordial Density Field

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jkas...31..109k&link_type=abstract

Journal of the Korean Astronomical Society, vol. 31, no. 2, pp. 109-115

Mathematics

Logic

1

Cosmlogy: Theory, Primordial Density Field: Statistical Properties, Under-Density Region, Method: Numerical

Scientific paper

We show that the low density regions of the matter distribution preserve the properties of the primordial density field better than the high density field. We have preformed a cosmological N-body simulation of large-scale structure formation in the stadard CDM cosmology, and studied the evolution of statistics of under-density and over-density regions separately. The rank-order of the under-density regions is closer to the original one compared to that of the over-density regions. The under-density peaks (or voids) has moved less than over-density peaks (or dense clusters of galaxies) from their initial positions. Therefore, the under-density regions are more useful than the over-density regions in the study of the statistical property of the primordial density field.

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