The Distinguishability of Interacting Dark Energy from Modified Gravity

Abstract

We study the observational viability of coupled quintessence models with their expansion and growth histories matched to modified gravity cosmologies. We find that for a Dvali-Gabadadze-Porrati model which has been fitted to observations, the matched interacting dark energy models are observationally disfavoured. We also study the distinguishability of interacting dark energy models matched to scalar-tensor theory cosmologies and show that it is not always possible to find a physical interacting dark energy model which shares their expansion and growth histories.

8 pages, 5 figures

References in corpus (33)

• Dynamics of dark energy
• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• Dark Energy and the Accelerating Universe
• Modified f(R) gravity consistent with realistic cosmology: from matter dominated epoch to dark energy universe
• Reconstructing Dark Energy
• The Large Scale Structure of f(R) Gravity
• Report of the Dark Energy Task Force
• Measuring the dark side (with weak lensing)
• A discriminating probe of gravity at cosmological scales
• Constraining f(R) Gravity as a Scalar Tensor Theory
• Confirmation of general relativity on large scales from weak lensing and galaxy velocities
• Distinguishing Modified Gravity from Dark Energy
• Observational Tests of Modified Gravity
• Dark Energy versus Modified Gravity
• The acceleration of the universe and the physics behind it
• Constraints on scalar-tensor models of dark energy from observational and local gravity tests
• On model selection forecasting, Dark Energy and modified gravity
• Differentiating dark energy and modified gravity with galaxy redshift surveys
• Coupled dark matter-dark energy in light of near Universe observations
• Next Generation Redshift Surveys and the Origin of Cosmic Acceleration
• Is Modified Gravity Required by Observations? An Empirical Consistency Test of Dark Energy Models
• Evolving Newton's Constant, Extended Gravity Theories and SnIa Data Analysis
• Observational signatures of Jordan-Brans-Dicke theories of gravity
• Consistency test of general relativity from large scale structure of the Universe
• Nonlinear growth in modified gravity theories of dark energy
• Dark Energy in Practice
• How to Distinguish Dark Energy and Modified Gravity?
• A Consistency Relation in Cosmology
• Testing gravity using the growth of large scale structure in the Universe
• Structure formation in $f(R)$ gravity: A distinguishing probe between the dark energy and modified gravity
• Acceleration from Modified Gravity: Lessons from Worked Examples
• Dark Energy: Beyond General Relativity?
• Constraints on scalar-tensor theories of gravity from observations