Topology in two dimensions. IV - CDM models with non-Gaussian initial conditions

Details Topology in two dimensions. IV - CDM models with non-Gaussian initial conditions Topology in two dimensions. IV - CDM models with non-Gaussian initial conditions

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.260..572c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 260, no. 3, p. 572-588.

Astronomy and Astrophysics

Astronomy

19

Astronomical Models, Galactic Clusters, Galactic Evolution, Topology, Astronomical Catalogs, Boundary Conditions, Dark Matter, Many Body Problem, Universe

Scientific paper

The results of N-body simulations with both Gaussian and non-Gaussian initial conditions are used here to generate projected galaxy catalogs with the same selection criteria as the Shane-Wirtanen counts of galaxies. The Euler-Poincare characteristic is used to compare the statistical nature of the projected galaxy clustering in these simulated data sets with that of the observed galaxy catalog. All the models produce a topology dominated by a meatball shift when normalized to the known small-scale clustering properties of galaxies. Models characterized by a positive skewness of the distribution of primordial density perturbations are inconsistent with the Lick data, suggesting problems in reconciling models based on cosmic textures with observations. Gaussian CDM models fit the distribution of cell counts only if they have a rather high normalization but possess too low a coherence length compared with the Lick counts. This suggests that a CDM model with extra large scale power would probably fit the available data.

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