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 $\Lambda$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.

arXiv comment10 pages, 6 figures

References in corpus (39)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Planck 2013 results. XVI. Cosmological parameters
• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• Cosmological Imprint of an Energy Component with General Equation of State
• The 6dF Galaxy Survey: Baryon Acoustic Oscillations and the Local Hubble Constant
• Baryonic Features in the Matter Transfer Function
• Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in the Data Release 10 and 11 galaxy samples
• Cosmology and Fundamental Physics with the Euclid Satellite
• Small Scale Cosmological Perturbations: An Analytic Approach
• Everything You Always Wanted To Know About The Cosmological Constant Problem (But Were Afraid To Ask)
• Power Spectra for Cold Dark Matter and its Variants
• Supernova Constraints and Systematic Uncertainties from the First 3 Years of the Supernova Legacy Survey
• Cosmology and fundamental physics with the Euclid satellite
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in the Data Release 9 Spectroscopic Galaxy Sample
• Probing Dark Energy with Baryonic Acoustic Oscillations from Future Large Galaxy Redshift Surveys
• Planck 2015 results. XI. CMB power spectra, likelihoods, and robustness of parameters
• A 2% Distance to z=0.35 by Reconstructing Baryon Acoustic Oscillations - I : Methods and Application to the Sloan Digital Sky Survey
• Measuring cosmological parameters with galaxy surveys
• Structure Formation with Generalized Dark Matter
• Planck 2015 results. XIV. Dark energy and modified gravity
• Improved forecasts for the baryon acoustic oscillations and cosmological distance scale
• Distance measures in cosmology
• Observational Constraints on Dark Energy and Cosmic Curvature
• Backreaction in late-time cosmology
• The Data Release of the Sloan Digital Sky Survey-II Supernova Survey
• The dark degeneracy: On the number and nature of dark components
• Designing a space-based galaxy redshift survey to probe dark energy
• Constraints on dark-matter properties from large-scale structure
• Constraining dark matter properties with Cosmic Microwave Background observations
• Effects of cosmological model assumptions on galaxy redshift survey measurements
• Probing deviations from General Relativity with the Euclid spectroscopic survey
• Planck intermediate results. XVI. Profile likelihoods for cosmological parameters
• The Dark Side of the Universe after Planck
• Relieving tensions related to the lensing of CMB temperature power spectra
• An Analytic Expression for the Growth Function in a Flat Universe with a Cosmological Constant
• Testing the EoS of dark matter with cosmological observations

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