Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-11-09
AIP Conf.Proc.861:858-866,2006
Astronomy and Astrophysics
Astrophysics
9 pages, 5 figures, in "Albert Einstein Century International Conference", Paris, 18-22 July 2005, AIP Proceedings Conference
Scientific paper
10.1063/1.2399670
Some physical imprints of quintessence scalar fields on dark matter (DM) clustering are illustrated, and a comparison with the concordance model $\Lambda CDM$ is highlighted. First, we estimate the cosmological parameters for two quintessence models, based on scalar fields rolling down the Ratra-Peebles or Sugra potential, by a statistical analysis of the Hubble diagram of type Ia supernovae. Then, the effect of these realistic dark energy models on large-scale DM clustering is established through N-body simulations. Various effects like large-scale distribution of DM, cluster mass function and halos internal velocities are illustrated. It is found that realistic dark energy models lead to quite different DM clustering, due to a combination of the variation of the equation of state and differences in the cosmological parameters, even at $z=0$. This conclusion contradicts other works in the recent litterature and the importance of considering more realistic models in studying the impact of quintessence on structure formation is highlighted.
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