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Commission 47: Cosmology: (Cosmologie)

Published online by Cambridge University Press:  25 April 2016

Alexander Szalay ,
John Peacock ,
Y. Chu L. da Costa ,
J. Einasto ,
G. Ellis ,
D. Koo ,
S. Lilly ,
J. Narlikar ,
P. Shaver  and
R. Webster
...Show all authors

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Cosmology is one of the most dynamically evolving areas of astrophysics today. Twenty years ago the estimates of the amplitude of the primordial fluctuations were about 10-3, almost a factor of 100 off of today’s measurements. Ten years ago we could only hope for high precision measurements of large scale structure, there were less than 5000 redshifts measured, and only a handful of normal galaxies with z > 1 were known. Computer models of structure formation had just begun to consider non-power-law spectra based on physical models like hot/cold dark matter. As a consequence there was considerable freedom in adjusting parameters in the various galaxy formation scenarios. In contrast, many of today’s debates are about factors of 2 and soon we will be arguing about 10% differences. The Harrison-Zeldovich shape of the primordial fluctuation spectrum, first derived from philosophical arguments can now be quantified from detections of fluctuations by COBE. The number of available redshifts is beyond 50,000, and soon we will have redshift surveys surpassing 1 million galaxies. N-body simulations are becoming more sophisticated, of higher resolution, and incorporating complex gas dynamics.

Type
Divisions and their Commissions
Information
Transactions of the International Astronomical Union , Volume 24 , Issue 1: Reports on Astronomy , 2000 , pp. 311 - 314
Copyright
Copyright © Astronomical Society of Pacific 2000

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