From inflation to Friedmann regime inR 2 cosmology

Details From inflation to Friedmann regime inR 2 cosmology From inflation to Friedmann regime inR 2 cosmology

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap%26ss.229..173l&link_type=abstract

Astrophysics and Space Science, Volume 229, Issue 2, pp.173-184

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

A cosmological model describing the different stages of the universe, i.e.: inflation, radiation dominated period and matter dominated (Friedmann-like) period is shown. The model consists of the usual gravitational lagrangian with aσ R 2 term, and, for the matter content, the lagrangian of a massive conformally coupled scalar field. The effect of backreaction is evaluated by means of an extremum condition on the entropy at each time. The differential equation, obtained when the lowest quantum order is considered, describes all the periods of evolution of the universe. For a range of values ofσ, inflation is unstable and the universe can reach the following regime.

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