Dark sectors of the Universe: A Euclid survey approach
| Autor: | Alain Blanchard, Isaac Tutusaus, Brahim Lamine, Yvan Rousset, Arnaud Dupays, Yves Zolnierowski |
|---|---|
| Přispěvatelé: | Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) 010308 nuclear & particles physics Equation of state (cosmology) Cosmic microwave background Dark matter Scalar field dark matter FOS: Physical sciences Lambda-CDM model Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] Theoretical physics 0103 physical sciences Dark energy Baryon acoustic oscillations 010303 astronomy & astrophysics Dark fluid Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Physical Review D Physical Review D, American Physical Society, 2016, 94 (12), pp.123515 ⟨10.1103/PhysRevD.94.123515⟩ |
| ISSN: | 1550-7998 1550-2368 |
| DOI: | 10.1103/PhysRevD.94.123515⟩ |
| Popis: | 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 $\Lambda$CDM model. We then examine the anticipated constraints from the galaxy clustering probe of 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. Comment: 10 pages, 6 figures |
| Databáze: | OpenAIRE |
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