Physics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.106..207c&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 106, no. 1, Nov. 1984, p. 207-209.
Physics
4
Cosmology, Matter (Physics), Universe, Cosmic Dust, Flux Density, Ideal Fluids, Radiation, Relativity, Space-Time Functions
Scientific paper
In attempting to obtain the solution to a more realistic isotropic flat space model of the Universe ifiled with noninteracting `radiation and nonrelativistic matter (dust)' in the Brans-Dicke cosmological theory (BDT), several general properties of this theory, are obtained: Besides the reescalation of the scalar field ~ as 4R3 fr, a natural reescalation for the energy density p as pR3 c is found to exist. Solutions for single component perfect fluids obey the relation ~/i = aT2 + bT + c, where T is a generalized `time parameter'. In contrast to general relativity theory (GRT), where the solution to a mixture of noninteracting `radiation and dust' is the sum of the `radiation' plus `dust' solutions taken separately, in BDT this is not so. Yet, the numerical value of the integration constant v can make the BDT solution almost indistinguishable from GRT, in the radiation dominated epoch
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