Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...251..429h&link_type=abstract
Astrophysical Journal, Part 1, vol. 251, Dec. 15, 1981, p. 429-435. Research supported by the Natural Sciences and Engineering
Astronomy and Astrophysics
Astrophysics
4
Background Radiation, Cosmology, Inhomogeneity, Relativity, Baryons, Black Body Radiation, Dust, Equations Of State, Photons
Scientific paper
An examination is undertaken of a class of inhomogeneities, embedded in a spatially flat Robertson-Walker background, which is restricted by the simplifying assumption that isotropic pressure equals local energy flux. Both a noninteracting mixture of blackbody photons and dust, and a baryon-conserving equilibrium mixture of blackbody photons and a neutral, two-component, relativistic Maxwell-Boltzmann gas, are used to describe the background. It is demonstrated through a comparison of the resultant mass of the inhomogeneities with the Jeans and particle horizon mass scales that varying the initial photon-to-baryon ratio in the background has a critical effect on all masses.
Helaby C.
Lake Kayll
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