Parametrised modified gravity and the CMB Bispectrum

Abstract

We forecast the constraints on modified theories of gravity from the cosmic microwave background (CMB) anisotropies bispectrum that arises from correlations between lensing and the Integrated Sachs-Wolfe effect. In models of modified gravity the evolution of the metric potentials is generally altered and the contribution to the CMB bispectrum signal can differ significantly from the one expected in the standard cosmological model.We adopt a parametrised approach and focus on three different classes of models: Linder's growth index, Chameleon-type models and f(R) theories. We show that the constraints on the parameters of the models will significantly improve with future CMB bispectrum measurements.

7 pages, 6 figures

References in corpus (18)

• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• Disappearing cosmological constant in f(R) gravity
• Class of viable modified $f(R)$ gravities describing inflation and the onset of accelerated expansion
• The Large Scale Structure of f(R) Gravity
• Observational signatures of f(R) dark energy models that satisfy cosmological and local gravity constraints
• Large Scale Structure as a Probe of Gravitational Slip
• Distinguishing Modified Gravity from Dark Energy
• Searching for modified growth patterns with tomographic surveys
• Degravitation of the Cosmological Constant and Graviton Width
• Cosmological Constraints on f(R) Acceleration Models
• Probing modifications of General Relativity using current cosmological observations
• Constraints on a New Post-General Relativity Cosmological Parameter
• Large-Scale Tests of the DGP Model
• Impact of Secondary non-Gaussianities on the Search for Primordial Non-Gaussianity with CMB Maps
• Cosmological perturbations in the DGP braneworld: numeric solution
• Constraining Modified Gravity with Euclid
• Detectability of a phantom-like braneworld model with the integrated Sachs-Wolfe effect
• Large Scale Structure Formation of Normal Branch in DGP Brane World Model

Cited by in corpus (2)

• The Parameterized Post-Friedmann Framework for Theories of Modified Gravity: Concepts, Formalism and Examples
• Probing Modified Gravity Theories with ISW and CMB Lensing