A Galileon Design of Slow Expansion

Details A Galileon Design of Slow Expansion A Galileon Design of Slow Expansion

2011-05-28

arxiv.org/abs/1105.5713v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 7 figures, minor changes and refs. added, published in PRD

Scientific paper

We show a model of the slow expansion, in which the scale invariant spectrum of curvature perturbation is adiabatically induced by its increasing mode, by applying a generalized Galileon field. In this model, initially \epsilon << -1, which then is rapidly increasing, during this period the universe is slowly expanding. There is not the ghost instability, the perturbation theory is healthy. When \epsilon \sim -1, the slow expansion phase ends, and the available energy of field can be released and the universe reheats. This scenario might be a viable design of the early universe.

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