The phenomenological approach to modeling the dark energy

Abstract

In this mini-review we discuss first why we should investigate cosmological models beyond LCDM. We then show how to describe dark energy or modified gravity models in a fluid language with the help of one background and two perturbation quantities. We review a range of dark energy models and study how they fit into the phenomenological framework, including generalizations like phantom crossing, sound speeds different from c and non-zero anisotropic stress, and how these effective quantities are linked to the underlying physical models. We also discuss the limits of what can be measured with cosmological data, and some challenges for the framework.

44 pages, 5 figures; accepted review article to appear in a special volume of the "Comptes Rendus de l'Academie des Sciences" about Dark Energy and Dark Matter

References in corpus (47)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Dynamics of dark energy
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Cosmology and the Fate of Dilatation Symmetry
• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• Improved Cosmological Constraints from New, Old and Combined Supernova Datasets
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
• Imperfect Dark Energy from Kinetic Gravity Braiding
• Avoiding Dark Energy with 1/R Modifications of Gravity
• A Parameterized Post-Friedmann Framework for Modified Gravity
• Measuring the dark side (with weak lensing)
• Distinguishing Modified Gravity from Dark Energy
• Modified gravity models of dark energy
• A general test of the Copernican Principle
• The Effective Theory of Quintessence: the w<-1 Side Unveiled
• Nonparametric Dark Energy Reconstruction from Supernova Data
• Testing gravity with CAMB and CosmoMC
• Confronting Lemaitre-Tolman-Bondi models with Observational Cosmology
• Current constraints on the cosmic growth history
• Time drift of cosmological redshifts as a test of the Copernican principle
• Accelerated expansion from structure formation
• Dynamical Dark Energy or Simply Cosmic Curvature?
• Observational constraints on self-accelerating cosmology
• Measuring the effective complexity of cosmological models
• How to optimally parametrize deviations from General Relativity in the evolution of cosmological perturbations
• Observables and unobservables in dark energy cosmologies
• Probing modifications of General Relativity using current cosmological observations
• Constraints on a New Post-General Relativity Cosmological Parameter
• Crossing the Phantom Divide
• Measuring the Speed of Dark: Detecting Dark Energy Perturbations
• No-go theorem for k-essence dark energy
• Dark energy with non-adiabatic sound speed: initial conditions and detectability
• Fingerprinting dark energy
• Estimation of cosmological parameters using adaptive importance sampling
• Consistency test of general relativity from large scale structure of the Universe
• Dark Energy in Practice
• Confronting General Relativity with Further Cosmological Data
• The linear growth rate of structure in Parametrized Post Friedmannian Universes
• Constraining the dark fluid
• Fingerprinting Dark Energy II: weak lensing and galaxy clustering tests
• Anisotropic stress and stability in modified gravity models
• Reconstructing the history of dark energy using maximum entropy
• Covariant Linear Perturbation Formalism
• A Tale of Two Distances
• Superluminal motion and closed signal curves
• Why we need to see the dark matter to understand the dark energy

Cited by in corpus (18)

• Maximal freedom at minimum cost: linear large-scale structure in general modifications of gravity
• Cosmological perturbations and structure formation in nonlocal infrared modifications of general relativity
• Observables and unobservables in dark energy cosmologies
• Generalized Second Law of Thermodynamics in $f(T)$ Gravity with Entropy Corrections
• Parameters of cosmological models and recent astronomical observations
• Cosmological dark energy effects from entanglement
• Generation of large-scale magnetic fields from inflation in teleparallelism
• Dynamical aspects for scalar fields coupled to cubic contractions of the Riemann tensor
• Testing gravity with gravitational wave friction and gravitational slip
• Constraining dark sector perturbations I: cosmic shear and CMB lensing
• The Effective Fluid approach for Modified Gravity and its applications
• Tracking the validity of the quasi-static and sub-horizon approximations in modified gravity
• Model-Independent Test for Gravity using Intensity Mapping and Galaxy Clustering
• A class of regular bouncing cosmologies
• Linear and non-linear Modified Gravity forecasts with future surveys
• Dark Energy Simulations
• Bayesian evidence and model selection approach for time-dependent dark energy
• Sound Mode and Scale-Dependent Growth in Two-Fluid Dynamical Dark Energy