A radiation and matterfilled universe in BransDicke cosmology
Abstract
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 BransDicke 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
 Publication:

Astrophysics and Space Science
 Pub Date:
 November 1984
 DOI:
 10.1007/BF00653929
 Bibcode:
 1984Ap&SS.106..207C
 Keywords:

 Cosmology;
 Matter (Physics);
 Universe;
 Cosmic Dust;
 Flux Density;
 Ideal Fluids;
 Radiation;
 Relativity;
 SpaceTime Functions;
 Astrophysics;
 DISCRIMINANT ANALYSIS (STATISTICS);
 PULSARS;
 STAR DISTRIBUTION;
 ASTRONOMICAL MODELS;
 ORTHOGONAL FUNCTIONS;
 PARAMETER IDENTIFICATION;
 STELLAR EVOLUTION