The avoidance of singularity in a friedmann universe by particle production

Details The avoidance of singularity in a friedmann universe by particle production The avoidance of singularity in a friedmann universe by particle production

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982nuphb.209..497r&link_type=abstract

Nuclear Physics B, Volume 209, Issue 2, p. 497-519.

Physics

Nuclear Physics

1

Scientific paper

When a self-interacting field presents classically several stable homogeneous ground states of different energy, a semiclassical description of the field predicts transition by barrier penetration to the state of minimum energy. If gravitational effects are considered in a minimally coupled system a singularity of space-time appears when the minimal value of the energy is negative. In this paper we analyze a similar problem, but for a self-interacting field non-minimally coupled to gravitation. First we show that the classical behaviour of the system remains unchanged. Afterwards we prove that when particle production generated by the time-varying gravitational field is taken into account, the singularity can be avoided.

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