Is the universe transparent or opaque?

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The author determines the maximal class of conformally flat cosmological models which eventually absorb all the electromagnetic radiation they contain. This is the requirement of the Wheeler-Feynman absorber theory of radiation. The condition for complete absorption is more or less written down immediately, and the various cosmological models tested by inspection. Some of the existing errors concerning the refractive index of the intergalactic medium and the past absorber are examined in some detail. Of the Friedmann cosmologies, only the oscillating models are opaque. A number of ever-expanding nonrelativistic cosmologies such as the Dirac and the latest Hoyle-Narlikar models, are also opaque. An assessment of the present value of the Wheeler-Feynman theory is given in the light of recent work on its quantization.

Original languageEnglish (US)
Article number012
Pages (from-to)1722-1737
Number of pages16
JournalJournal of Physics A: General Physics
Volume5
Issue number12
DOIs
StatePublished - 1972
Externally publishedYes

Fingerprint

Cosmological Models
Absorber
universe
Radiation
Conformally Flat
Refractive Index
Paul Adrien Maurice Dirac
Immediately
Inspection
Quantization
absorbers
Absorption
intergalactic media
Requirements
Model
Electromagnetic waves
inspection
Refractive index
electromagnetic radiation
refractivity

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Physics and Astronomy(all)
  • Mathematical Physics

Cite this

Is the universe transparent or opaque? / Davies, Paul.

In: Journal of Physics A: General Physics, Vol. 5, No. 12, 012, 1972, p. 1722-1737.

Research output: Contribution to journalArticle

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