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Memorable statements about the cosmological principle

Andrzej Krasiński

DOI: 10.1017/cbo9780511721694.013 (Physics and Astronomy)
License: not stated (all rights reserved)

Abstract: This appendix is meant to pay justice to those authors who could see earlier than others that the FLRW models are an oversimplification of Nature. It contains a short (and very possibly incomplete) selection of quotations. … the grounds on which homogeneity is generally assumed appearing to be those of convenience rather than generality … We must categorically dissent from the extreme idea … that homogeneity is included in the definition of the universe … We take it to be perfectly conceivable that an increase of telescopic power may reveal a variation of material density with distance, and the denial of this possibility … seems to us to be inconsistent with the fundamental principles of science. We hold that the assumption of spatial homogeneity is … a working hypothesis, valid so long as it does not conflict with observation or with theoretical probability, and justifiable during that time as a restriction on arbitrary speculation … we have no grounds for supposing that the part of the universe which is observed is typical of the whole … the phenomena we embody in our models may be purely local characteristics … while, in the present state of knowledge, a spatially homogeneous universe has greater claims to consideration than any other, such claims … have no a priori justification. (Dingle 1933)

Published on 19 Jun. 1997