Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.182..537b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 182, Feb. 1978, p. 537-558.
Astronomy and Astrophysics
Astronomy
11
Anisotropic Media, Black Holes (Astronomy), Cosmology, Space Density, Background Radiation, Equations Of State, Flux Density, Jeans Theory, Shear Properties, Universe
Scientific paper
The effect of anisotropy on primordial-black-hole formation is investigated. Basic features of anisotropic and chaotic models of the early universe are reviewed, the behavior of density fluctuations in models containing a (homogeneous) primordial shear field is analyzed, and it is shown how these density fluctuations induce shear fluctuations. Conditions under which inhomogeneities could give rise to black holes are examined, and it is found that primordial shear could have an important inhibiting effect on black-hole formation. The argument is advanced that as long as shear dominates the energy of the universe, it determines the Jeans length and effectively produces a 'stiff' equation of state. It is concluded that black-hole formation may be impossible as long as shear dominates the energy density of the universe and is 'marginally impossible' in an anisotropy-dominated universe. Astrophysical consequences of these results are discussed.
Barrow John D.
Carr Bernard J.
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