Parametrizing modified gravity for cosmological surveys
arXiv:1705.04714 · doi:10.1103/PhysRevD.96.063516
Abstract
One of the challenges in testing gravity with cosmology is the vast freedom opened when extending General Relativity. For linear perturbations, one solution consists in using the Effective Field Theory of Dark Energy (EFT of DE). Even then, the theory space is described in terms of a handful of free functions of time. This needs to be reduced to a finite number of parameters to be practical for cosmological surveys. We explore in this article how well simple parametrizations, with a small number of parameters, can fit observables computed from complex theories. Imposing the stability of linear perturbations appreciably reduces the theory space we explore. We find that observables are not extremely sensitive to short time-scale variations and that simple, smooth parametrizations are usually sufficient to describe this theory space. Using the Bayesian Information Criterion, we find that using two parameters for each function (an amplitude and a power law index) is preferred over complex models for 86% of our theory space.
10 pages, 5 figures
References in corpus (55)
- Efficient Computation of CMB anisotropies in closed FRW models
- A Dynamical Solution to the Problem of a Small Cosmological Constant and Late-time Cosmic Acceleration
- The DESI Experiment Part I: Science,Targeting, and Survey Design
- Covariant Galileon
- Wide-Field InfrarRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA 2015 Report
- Cosmology and Fundamental Physics with the Euclid Satellite
- Euclid Definition Study Report
- LSST Science Book, Version 2.0
- Cosmology and fundamental physics with the Euclid satellite
- Cosmological implications of baryon acoustic oscillation (BAO) measurements
- Healthy theories beyond Horndeski
- Imperfect Dark Energy from Kinetic Gravity Braiding
- Degenerate higher derivative theories beyond Horndeski: evading the Ostrogradski instability
- Transforming gravity: from derivative couplings to matter to second-order scalar-tensor theories beyond the Horndeski Lagrangian
- Cosmology with cosmic shear observations: a review
- The Effective Field Theory of Dark Energy
- Exploring gravitational theories beyond Horndeski
- Power Spectrum Tomography with Weak Lensing
- Maximal freedom at minimum cost: linear large-scale structure in general modifications of gravity
- Essential Building Blocks of Dark Energy
- Degenerate higher order scalar-tensor theories beyond Horndeski and disformal transformations
- Dark Energy or Modified Gravity? An Effective Field Theory Approach
- A Lower Growth Rate from Recent Redshift Space Distortion Measurements than Expected from Planck
- Effective Field Theory of Cosmic Acceleration: an implementation in CAMB
- A unifying description of dark energy
- Cosmology with the SPHEREX All-Sky Spectral Survey
- Speed of Gravitational Waves and the Fate of Scalar-Tensor Gravity
- Hamiltonian analysis of higher derivative scalar-tensor theories
- The Impact of Non-Gaussian Errors on Weak Lensing Surveys
- hi_class: Horndeski in the Cosmic Linear Anisotropy Solving System
- Constraining primordial non-Gaussianity with future galaxy surveys
- Limits of Quasi-Static Approximation in Modified-Gravity Cosmologies
- Optimal Surveys for Weak Lensing Tomography
- Horndeski: beyond, or not beyond?
- The Observational Future of Cosmological Scalar-Tensor Theories
- Gravitational Lensing of Distant Field Galaxies by Rich Clusters: I. -- Faint Galaxy Redshift Distributions
- The observational status of Galileon gravity after Planck
- Effective Theory of Interacting Dark Energy
- Weak lensing by voids in modified lensing potentials
- The Paths of Gravity in Galileon Cosmology
- Counting the degrees of freedom of generalized Galileons
- Analysis of two-point statistics of cosmic shear: III. Covariances of shear measures made easy
- Effective Theory of Dark Energy at Redshift Survey Scales
- Classical and quantum ghosts
- Empirical H-alpha emitter count predictions for dark energy surveys
- Testing coupled dark energy with next-generation large-scale observations
- Phenomenology of dark energy: general features of large-scale perturbations
- A general theory of linear cosmological perturbations: scalar-tensor and vector-tensor theories
- Challenges in Connecting Modified Gravity Theory and Observations
- Gravity at the horizon: on relativistic effects, CMB-LSS correlations and ultra-large scales in Horndeski's theory
- Weakening Gravity on Redshift-Survey Scales with Kinetic Matter Mixing
- Priors on the effective Dark Energy equation of state in scalar-tensor theories
- Quintessence in a quandary: prior dependence in dark energy models
- A general theory of linear cosmological perturbations: bimetric theories
- Linear and non-linear Modified Gravity forecasts with future surveys
Cited by in corpus (32)
- Dark Energy and Modified Gravity in Degenerate Higher-Order Scalar-Tensor (DHOST) theories: a review
- Dark Energy in light of Multi-Messenger Gravitational-Wave astronomy
- Generalized framework for testing gravity with gravitational-wave propagation. II. Constraints on Horndeski theory
- Standard sirens with a running Planck mass
- Probing observational bounds on scalar-tensor theories from standard sirens
- The Novel Probes Project -- Tests of Gravity on Astrophysical Scales
- Cosmological parameter constraints for Horndeski scalar-tensor gravity
- Cosmological Constraints on Horndeski Gravity in Light of GW170817
- Positivity in the sky
- Nonlinear Effective Theory of Dark Energy
- KiDS+GAMA: Constraints on Horndeski gravity from combined large-scale structure probes
- Testing (modified) gravity with 3D and tomographic cosmic shear
- Cosmological constraints on dark energy in light of gravitational wave bounds
- A general theory of linear cosmological perturbations: stability conditions, the quasistatic limit and dynamics
- Modified Gravity Constraints from the Full Shape Modeling of Clustering Measurements from DESI 2024
- Optimising growth of structure constraints on modified gravity
- Hearing gravity from the cosmos: GWTC-2 probes general relativity at cosmological scales
- Reconstructing Horndeski theories from phenomenological modified gravity and dark energy models on cosmological scales
- Primordial gravitational waves in Horndeski gravity
- Forecasts on the speed of gravitational waves at high
- Reconstructing Horndeski models from the effective field theory of dark energy
- Inherently stable effective field theory for dark energy and modified gravity
- Radiative stability and observational constraints on dark energy and modified gravity
- Cosmological evolution of viable models in the generalized scalar-tensor theory
- Dark sector evolution in Horndeski models
- Subpercent Accurate Fitting of Modified Gravity Growth
- Scale-Dependent Gravitational Couplings in Parameterised Post-Newtonian Cosmology
- On tachyonic stability priors for dark energy
- Modified propagation of gravitational waves from the early radiation era
- KiDS-Legacy: Constraints on Horndeski gravity from weak lensing combined with galaxy clustering and cosmic microwave background anisotropies
- Theoretical priors in scalar-tensor cosmologies: Shift-symmetric Horndeski models
- Dark energy constraints in light of theoretical priors