The traces of anisotropic dark energy in light of Planck

Abstract

We study a dark energy model with non-zero anisotropic stress, either linked to the dark energy density or to the dark matter density. We compute approximate solutions that allow to characterise the behaviour of the dark energy model and to assess the stability of the perturbations. We also determine the current limits on such an anisotropic stress from the cosmic microwave background data by the Planck satellite, and derive the corresponding constraints on the modified growth parameters like the growth index, the effective Newton's constant and the gravitational slip.

29 pages, 10 figures; matches version accepted for publication in JCAP

References in corpus (19)

• Dynamics of dark energy
• Dark Energy and the Accelerating Universe
• Supernova Constraints and Systematic Uncertainties from the First 3 Years of the Supernova Legacy Survey
• A Parameterized Post-Friedmann Framework for Modified Gravity
• Measuring the dark side (with weak lensing)
• Dark Energy versus Modified Gravity
• Current constraints on the cosmic growth history
• The Parameterized Post-Friedmann Framework for Theories of Modified Gravity: Concepts, Formalism and Examples
• How to optimally parametrize deviations from General Relativity in the evolution of cosmological perturbations
• Observables and unobservables in dark energy cosmologies
• Constraining Dark Energy Anisotropic Stress
• Measuring the Speed of Dark: Detecting Dark Energy Perturbations
• The phenomenological approach to modeling the dark energy
• Fingerprinting dark energy
• Dark Energy in Practice
• Consistent perturbations in an imperfect fluid
• Probing Dark Energy through Scale Dependence
• Anisotropic stress and stability in modified gravity models
• Can dark energy viscosity be detected with the Euclid survey?

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• Measurements of $H_0$ and reconstruction of the dark energy properties from a model-independent joint analysis
• Designing Horndeski and the effective fluid approach
• Hints of dark energy anisotropic stress using Machine Learning
• On the current status of Modified Gravity
• Cosmological constraints on non-adiabatic dark energy perturbations
• Combined constraints on deviations of dark energy from an ideal fluid from Euclid and Planck
• Forecast constraints on Anisotropic Stress in Dark Energy using gravitational-waves
• Constraining dark sector perturbations II: ISW and CMB lensing tomography
• The Effective Fluid approach for Modified Gravity and its applications
• Tracking the validity of the quasi-static and sub-horizon approximations in modified gravity
• Matter Growth in Imperfect Fluid Cosmology
• Effects of Dark Energy anisotropic stress on the matter power spectrum
• Lensing convergence and anisotropic dark energy in galaxy redshift surveys
• An effective fluid description of scalar-vector-tensor theories under the sub-horizon and quasi-static approximations
• Matter growth in extended $\Lambda$CDM cosmology