The Development of Large Scale Cosmic Structure:. A Theoretician's Approach

Details The Development of Large Scale Cosmic Structure:. A Theoretician's Approach The Development of Large Scale Cosmic Structure:. A Theoretician's Approach

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ppu..conf..164o&link_type=abstract

PARTICLE PHYSICS AND THE UNIVERSE. Proceedings of Nobel Symposium 109. Held 20-25 August 1998 in Haga Slott, Enköping, Sweden. E

Physics

Scientific paper

The study of cosmology, the origin, nature and future evolution of structure in the universe, has been totally transformed in the last decade, and computers have played a major role in the change. New theories have arisen from particle physics which make the subject, formerly almost a branch of philosophy, into quantitative science. Initial, semi-quantitative tests of these theories, either using data on galaxy distributions in the local universe or the cosmic background radiation fluctuations reaching us from the distant universe, indicate rough agreement with the simplest predictions of the theories. But now that fully three-dimensional, time-dependent numerical simulations can be made on modern, parallel architecture computers, we can examine (using good physical modelling) the detailed quantitative predictions of the various theories that have been proposed to see which, if any, can produce an output consistent with the real world being revealed to us by the latest ground-and space-based instruments. Using these tools, we have been able to reduce to a small number the currently viable options for the correct cosmological theory. At present, the most acceptable model, passing all presently applied tests, is the low density but flat Cold Dark Matter model with Ωbaryon = 0.04, ΩCDM = 0.26, ΩLambda = 0.70. The nature of the "cosmological constant" presents a challenging problem of physics.

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