Statistics – Computation
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989crasm.309..791f&link_type=abstract
Academie des Sciences (Paris), Comptes Rendus, Serie II - Mecanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Ter
Statistics
Computation
1
Astronomical Models, Cosmology, Perturbation Theory, Computational Astrophysics, Density (Mass/Volume), Relativistic Theory, Space-Time Functions
Scientific paper
The problem of the time evolution of density perturbations in Brans-Dicke theory is examined for the case of a homogeneous and isotropic universe which is filled by a perfect fluid whose energy-momentum tensor is conservative and whose equation of state is barotropic. Large-scale inhomogeneities with constant entropy are considered. Departures from the theory of general relativity are noted, and the existence of nonsingular solutions is demonstated for omega values of less than -3/2. It is shown that modifications to general relativity (with respect to the condensation rate of density perturbations) obtained by the addition of the scalar field are not sufficient to produce growth rates which are significantly larger than those obtained within the framework of general relativity.
Baptista Jose Plinio
Batista Antonio Brasil
Fabris Julio Cesar
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