Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975phdt.........3w&link_type=abstract
Ph.D. Thesis Massachusetts Univ., Amherst.
Astronomy and Astrophysics
Astrophysics
Astronomical Models, Cosmology, Astrophysics, Background Radiation, Entropy, Expansion, Isotropy, Universe, Viscosity
Scientific paper
A local approach to cosmology was developed in which it is attempted to understand, from strictly local considerations, the principal observable properties of homogeneous cosmological models. The local line element was obtained for some simple general-relativistic models. The optical appearance of distant objects, number counts, and the effects of local inhomogeneities on such observations are discussed in the isotropic case. The concept of the partitioned universe, in which physical conditions are mimicked by conditions inside a small, expanding cell with perfectly reflecting walls, was developed as a tool for simplifying the discussion of the background radiation, Olbers' paradox, the temperature and physical state of the cosmological fluid, entropy generation, and the effects of anisotropic expansion. This treatment revealed a possible error in Weinberg's (1971) discussion of bulk viscosity and entropy generation in the early universe.
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