A Caltech Library Service

Effect of inhomogeneity on cosmological models

Tolman, Richard C. (1934) Effect of inhomogeneity on cosmological models. Proceedings of the National Academy of Sciences of the United States of America, 20 (3). pp. 169-176. ISSN 0027-8424.

See Usage Policy.


Use this Persistent URL to link to this item:


In the application of relativistic mechanics and relativistic thermodynamics to cosmology, it has been usual to consider homogeneous models of the universe, filled with an idealized fluid, which at any given time has the same properties throughout the whole of its spatial extent. This procedure has a certain heuristic justification on account of the greater mathematical simplicity of homogeneous as compared with non-homogeneous models, and has a measure of observational justification on account of the approximate uniformity in the large scale distribution of extra-galactic nebulae, which is found out to the some 108 light-years which the Mount Wilson 100-inch telescope has been able to penetrate. Nevertheless, it is evident that some preponderating tendency for inhomogeneities to disappear with time would have to be demonstrated, before such models could be used with confidence to obtain extrapolated conclusions as to the behavior of the universe in very distant regions or over exceedingly long periods of time.

Item Type:Article
Related URLs:
URLURL TypeDescription
Additional Information:© 1934 by the National Academy of Sciences. Communicated February 12, 1934.
Issue or Number:3
Record Number:CaltechAUTHORS:TOLpnas34c
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9466
Deposited By: Tony Diaz
Deposited On:09 Jan 2008
Last Modified:03 Oct 2019 00:00

Repository Staff Only: item control page