Astrophysics and Space Science

, Volume 182, Issue 2, pp 221–225 | Cite as

Can Brans-Dicke universes in five dimensions be interpreted as 4-dimensional general relativity cosmologies?

  • J. Benítez
  • A. N. Morales
  • O. Obregón
Article
  • 35 Downloads

Abstract

The 5-dimensional Jordan-Brans-Dicke cosmologies in vacuum are found for the Bianchi type I metric, their relation with general relativity cosmologies is studied. Two solutions are possible, both produce effective pressure and energy density in the 4-dimensional G.R.-universes. One is a power-law relation, with two cases, the first one is forpeffeff and the other forpeff=αρeff(− 1 < α < 1) has a behaviour as the open flat universe. The second solution is an exponential only valid forpeff=−ρeff. In all cases the three-space expansion reaches infinity ast→∞ and the fifth dimension can be made to decrease approaching zero. The scalar field can increase or decrease with time.

Keywords

Energy Density General Relativity Scalar Field Effective Pressure Bianchi Type 

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Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • J. Benítez
    • 1
  • A. N. Morales
    • 1
  • O. Obregón
    • 1
  1. 1.Departamento de FísicaUniversidad Autónoma MetropolitanaIztapalapaMexico

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