Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.286..360h&link_type=abstract
Nature, vol. 286, July 24, 1980, p. 360-362.
Astronomy and Astrophysics
Astrophysics
10
Astrophysics, Big Bang Cosmology, Universe, Galactic Clusters, Phase Transformations
Scientific paper
Fundamental constraints on the spontaneous production of cosmological fluctuations giving rise to galaxies and galactic clusters in an originally uniform universe are presented, and a model for the generation of inhomogeneities is proposed. It is shown that in the standard hot big bang cosmology, no classical general relativistic process can create the actual observed scale of inhomogeneity. In a cold degenerate universe with specific entropy less than or equal to 1, however, phase transitions of the shattering or cracking types in cold matter at densities of 10 to the 13th to 10 to the 14th g/cu cm would create lumps on the order of the Chandrasekhar mass which may explain the observed inhomogeneity. It is suggested that such a critical point can occur at nuclear density during the transition from pion condensate to Fermi gas. Shattering at this stage would result in fragments providing the lumpiness necessary to produce galaxy clusters and a potential source of energy for the microwave background in a cold model
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