Origin of pregalactic microwave background

  title={Origin of pregalactic microwave background},
  author={Martin J. Rees},
  • M. Rees
  • Published 1 September 1978
  • Physics
  • Nature
THE photon density in the observed thermal (∼2.7 K) microwave background is nγ0=≃400 cm−3. This contrasts with the present mean baryon density in the Universe, nb0, which is in the range 10−5–10−6 cm−3. In the standard ‘hot big bang’ cosmology, the ratio nγ/nb is essentially constant during the expansion, its value being𝒮=nγ/nb≃3.6 × 107(Ωh2)−1. (1)h denotes the Hubble constant H0 in units of 100 km s−1 Mpc−1 and Ω = 8/3πGρH0−2 is the usual density parameter. 𝒮 is an undetermined free… 

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