Dark sectors of the Universe: A Euclid survey approach

Abstract : In this paper we study the consequences of relaxing the hypothesis of the pressureless nature of the dark matter component when determining constraints on dark energy. To this aim we consider simple generalized dark matter models with constant equation of state parameter. We find that present-day low-redshift probes (type-Ia supernovae and baryonic acoustic oscillations) lead to a complete degeneracy between the dark energy and the dark matter sectors. However, adding the cosmic microwave background (CMB) high-redshift probe restores constraints similar to those on the standard ΛCDM model. We then examine the anticipated constraints from the future Euclid survey on the same class of models, using a Fisher forecast estimation. We show that the Euclid survey allows us to break the degeneracy between the dark sectors, although the constraints on dark energy are much weaker than with standard dark matter. The use of CMB in combination allows us to restore the high precision on the dark energy sector constraints.
Type de document :
Article dans une revue
Physical Review D, American Physical Society, 2016, 94 (12), pp.123515 〈10.1103/PhysRevD.94.123515〉
Liste complète des métadonnées

http://hal.in2p3.fr/in2p3-01503464
Contributeur : Claudine Bombar <>
Soumis le : vendredi 7 avril 2017 - 10:29:50
Dernière modification le : jeudi 11 janvier 2018 - 06:13:33

Lien texte intégral

Identifiants

Collections

Citation

I. Tutusaus, B. Lamine, A. Blanchard, A. Dupays, Y. Rousset, et al.. Dark sectors of the Universe: A Euclid survey approach. Physical Review D, American Physical Society, 2016, 94 (12), pp.123515 〈10.1103/PhysRevD.94.123515〉. 〈in2p3-01503464〉

Partager

Métriques

Consultations de la notice

84