Cosmic Structure Formation

Abstract

This article reviews the prevailing paradigm for how galaxies and larger structures formed in the universe: gravitational instability. Basic observational facts are summarized to motivate the standard cosmological framework underlying most detailed investigations of structure formation. The observed universe approaches spatial uniformity on scales larger than about $10^{26}$ cm. On these scales gravitational dynamics is almost linear and therefore relatively easy to relate to observations of large-scale structure. On smaller scales cosmic structure is complicated not only by nonlinear gravitational clustering but also by nonlinear nongravitational gas dynamical processes. The complexity of these phenomena makes galaxy formation one of the grand challenge problems of the physical sciences. No fully satisfactory theory can presently account in detail for the observed cosmic structure. However, as this article summarizes, significant progress has been made during the last few years.

38 pages, plain Latex, figures and postscript available by anonymous ftp to arcturus.mit.edu, proceedings of CNLS 13, preprint IAS-AST-93/68 and MIT-CSR-93-31

References in corpus (12)

• The Cosmological Constant
• The Cold Dark Matter Density Perturbation
• Second Order Power Spectrum and Nonlinear Evolution at High Redshift
• Cosmic Microwave Background Probes Models of Inflation
• Structure Formation with Cold + Hot Dark Matter
• Grand Unification, Gravitational Waves, and the Cosmic Microwave Background Anisotropy
• Gravitational Instability of Cold Matter
• A Calculation of the Full Neutrino Phase Space in Cold+Hot Dark Matter Models
• Maximum-Likelihood Analysis of the COBE Angular Correlation Function
• Large- and Small-Scale Constraints on Power Spectra in $\Omega =1$ Universes
• The Search for the Dark Matter: WIMPs and MACHOs
• Amplitude of Primeval Fluctuations from Cosmological Mass Density Reconstructions

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• On the generality of a cosmological speculation based on Heisenberg's principle