Issue EAS Publications Series Volume 36, 2009 Dark Energy and Dark Matter: Observations, Experiments and Theories Page(s) 161 - 166 DOI 10.1051/eas/0936023 Published online 30 May 2009

Dark Energy and Dark Matter: Observations, Experiments and Theories
E. Pécontal, T. Buchert, Ph. Di Stefano and Y. Copin (eds)
EAS Publications Series, 36 (2009) 161-166
DOI: 10.1051/eas/0936023

Dark Energy vs. Dark Matter: Towards a Unifying Scalar Field?

A. Arbey

Université de Lyon, 69000 Lyon, France; Université Lyon 1, 69622 Villeurbanne, France; Centre de Recherche Astrophysique de Lyon, Observatoire de Lyon, 9 avenue Charles André, 69561 Saint-Genis Laval Cedex, France; CNRS, UMR 5574, École Normale Supérieure de Lyon, Lyon, France;

arbey@obs.univ-lyon1.fr

Published online: 30 May 2009

Abstract
The standard model of cosmology suggests the existence of two components, “dark matter” and “dark energy”, which determine the fate of the Universe. Their nature is still under investigation, and no direct proof of their existences has emerged yet. There exist alternative models which reinterpret the cosmological observations, for example by replacing the dark energy/dark matter hypothesis by the existence of a unique dark component, the dark fluid, which is able to mimic the behaviour of both components. After a quick review of the cosmological constraints on this unifying dark fluid, we will present a model of dark fluid based on a complex scalar field and discuss the problem of the choice of the potential.

© EAS, EDP Sciences 2009

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