Hostname: page-component-cd9895bd7-gvvz8 Total loading time: 0 Render date: 2024-12-12T18:41:37.744Z Has data issue: false hasContentIssue false
  • English
  • Français

Remarks on cosmology

Published online by Cambridge University Press:  14 August 2015

G. C. Mcvittie
G. C. Mcvittie*
Affiliation:
University of Illinois Observatory, Urbana, Illinois, U.S.A.

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

First, I should like to say something about the use of highly specialized models in cosmology. The Einstein—de Sitter model is a relativistic model in which the cosmical constant and the space-curvature constant are both equated to zero. Likewise, the pressure is assumed to be zero throughout the history of the universe, except perhaps at the initial instant. It is well-known that the first two constants can be determined from observation, if not at present, at any rate as the data are refined in the future. Hence, I think it is a weakness to prejudge the issue and assign a priori values. Nor is it self-evident to me that the pressure must always have been zero even if it is zero now. Composite models, with nonzero pressure at first, followed by a zero-pressure condition, need to be examined.

Type
Part V Discrete Sources and the Universe
Information
Symposium - International Astronomical Union , Volume 9: Paris Symposium on Radio Astronomy , 1959 , pp. 533 - 535
Copyright
Copyright © Stanford University Press 1959 

References

1. Humason, M. L., Mayall, N. U., and Sandage, A. R. A.J. 61, 97, 1956.Google Scholar
2. McVittie, G. C. Handbuch der Physik , vol. 53. (In press.) Google Scholar
3. Mills, B. Y., and Slee, O. B. Aust. J. Phys. 10, 162, 1957.Google Scholar
4. McVittie, G. C. Aust. J. Phys. 10, 331, 1957.Google Scholar