Modelling the Large Scale Structure of the Universe after COBE

N-body models running on supercomputers have been widely used to explore the development of structure in the expanding Universe. Recent results from the COBE satellite have provided a global normalisation of these models which now allows detailed comparisons to be drawn between observations and model predictions. Some predictions of the cold dark matter primordial perturbation spectrum are now shown to be consistent with surveys of galaxy redshifts.

Download Full-text

The large-scale structure of the universe in skewed cold dark matter models

Astroparticle Physics ◽

10.1016/0927-6505(92)90011-n ◽

1992 ◽

Vol 1 (1) ◽

pp. 99-112 ◽

Cited By ~ 3

Author(s):

A. Messina ◽

F. Lucchin ◽

S. Matarrese ◽

L. Moscardini

Keyword(s):

Dark Matter ◽

Large Scale ◽

Cold Dark Matter ◽

Large Scale Structure ◽

Scale Structure ◽

The Universe

Download Full-text

Large-Scale Structure in the Universe: Spatial Distribution and Peculiar Velocities

Symposium - International Astronomical Union ◽

10.1017/s0074180900159303 ◽

1987 ◽

Vol 124 ◽

pp. 335-348

Author(s):

Neta A. Bahcall

Keyword(s):

Dark Matter ◽

Spatial Distribution ◽

Large Scale ◽

Large Scale Structure ◽

Scale Structure ◽

Clusters Of Galaxies ◽

Large Scale Structures ◽

Peculiar Velocities ◽

Scale Structures ◽

The Universe

The evidence for the existence of very large scale structures, ∼ 100h−1Mpc in size, as derived from the spatial distribution of clusters of galaxies is summarized. Detection of a ∼ 2000 kms−1 elongation in the redshift direction in the distribution of the clusters is also described. Possible causes of the effect are peculiar velocities of clusters on scales of 10–100h−1Mpc and geometrical elongation of superclusters. If the effect is entirely due to the peculiar velocities of clusters, then superclusters have masses of order 1016.5M⊙ and may contain a larger amount of dark matter than previously anticipated.

Download Full-text

Large Scale Structure in Universes Dominated by Cold Dark Matter

Galaxy Distances and Deviations from Universal Expansion ◽

10.1007/978-94-009-4702-3_43 ◽

1986 ◽

pp. 255-263 ◽

Cited By ~ 5

Author(s):

J. Richard Bond

Keyword(s):

Dark Matter ◽

Large Scale ◽

Cold Dark Matter ◽

Large Scale Structure ◽

Scale Structure

Download Full-text

N-body Simulations of Galaxy Formation

Symposium - International Astronomical Union ◽

10.1017/s0074180900136137 ◽

1988 ◽

Vol 130 ◽

pp. 259-271

Author(s):

Carlos S. Frenk

Keyword(s):

Dark Matter ◽

Galaxy Formation ◽

Large Scale ◽

Cold Dark Matter ◽

Large Scale Structure ◽

High Density ◽

Galactic Halos ◽

Body Techniques ◽

Massive Halos ◽

The Universe

Modern N-body techniques allow the study of galaxy formation in the wider context of the formation of large-scale structure in the Universe. The results of such a study within the cold dark matter cosmogony are described. Dark galactic halos form at relatively recent epochs. Their properties and abundance are similar to those inferred for the halos of real galaxies. Massive halos tend to form preferentially in high density regions and as a result the galaxies that form within them are significantly more clustered than the underlying mass. This natural bias may be strong enough to reconcile the observed clustering of galaxies with the assumption that Ω = 1.

Download Full-text

Large-Scale Structure of the Universe in Unstable Dark Matter Models

Symposium - International Astronomical Union ◽

10.1017/s0074180900136174 ◽

1988 ◽

Vol 130 ◽

pp. 293-300

Author(s):

A.G. Doroshkevich ◽

A.A. Klypin ◽

M.U. Khlopov

Keyword(s):

Dark Matter ◽

Galaxy Formation ◽

Large Scale ◽

Numerical Models ◽

Large Scale Structure ◽

Scale Structure ◽

Microwave Background ◽

Physical Background ◽

The Mean ◽

The Universe

Processes of the formation and the evolution of the large-scale structure are discussed in the framework of unstable dark matter models. Six numerical models are presented. The projected distribution of simulated galaxies on the sky, wedge diagrams, correlation functions and the mean linear scale of voids are presented. Physical background of the hypothesis of unstable particles and possible observational tests are discussed. The level of the microwave background fluctuations is estimated analytically. Special attention is given to late stage of supercluster evolution and galaxy formation.

Download Full-text

Towards Understanding the Large-Scale Structure?

Symposium - International Astronomical Union ◽

10.1017/s0074180900159376 ◽

1987 ◽

Vol 124 ◽

pp. 415-432

Author(s):

Avishai Dekel

Keyword(s):

Dark Matter ◽

First Principles ◽

Large Scale ◽

Cold Dark Matter ◽

Ad Hoc ◽

Large Scale Structure ◽

Scale Structure ◽

Observational Constraints ◽

Microwave Background ◽

Satisfactory Theory

Although some theories, such as that of cold dark matter, are quite successful in explaining certain aspects of the formation of structure, we seem not to approach a satisfactory theory which can easily account for all the observational constraints on all scales. Most difficult to explain are the indicated clustering of clusters and bulk velocities on very large scales, when considered together with the structure on galactic scales and the isotropy of the microwave background. If these observations are correct, the only scenarios that can work are hybrids of certain sorts, which involve somewhat ad hoc choices of parameters; they are not the theories that would have emerged naturally from first principles, and they do not satisfy the criteria of simplicity and elegancy. I will discuss the currently popular scenarios and the apparent difficulties they face.

Download Full-text