The Accelerated expansion of the Universe as a crossover phenomenon

Details The Accelerated expansion of the Universe as a crossover phenomenon The Accelerated expansion of the Universe as a crossover phenomenon

2005-07-28

arxiv.org/abs/astro-ph/0507670v2

Class.Quant.Grav.23:3103-3110,2006

Astronomy and Astrophysics

Astrophysics

12 pages, latex, use bibtex. In the final version, the presentation has been improved, and new references have been added

Scientific paper

10.1088/0264-9381/23/9/020

We show that the accelerated expansion of the Universe can be viewed as a crossover phenomenon where the Newton constant and the Cosmological constant are actually scaling operators, dynamically evolving in the attraction basin of a non-Gaussian infrared fixed point, whose existence has been recently discussed. By linearization of the renormalized flow it is possible to evaluate the critical exponents, and it turns out that the approach to the fixed point is ruled by a marginal and a relevant direction. A smooth transition between the standard Friedmann--Lemaitre--Robertson--Walker (FLRW) cosmology and the observed accelerated expansion is then obtained, so that $\Omega_M \approx \Omega_\Lambda$ at late times.

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