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

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• Exploring Cosmic Origins with CORE: Cosmological Parameters
• Cosmological Hints of Modified Gravity ?
• Constraining models of $f(R)$ gravity with Planck and WiggleZ power spectrum data
• Halo modelling in chameleon theories
• Testing deviations from $\Lambda$CDM with growth rate measurements from 6 Large Scale Structure Surveys at $\mathbf{z}=0.06$ to 1
• Parametrized modified gravity constraints after Planck
• A new coupled three-form dark energy model and implications for the $H_0$ tension
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• Polarization bispectrum for measuring primordial magnetic fields
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• Cosmological data and indications for new physics
• Simultaneous effect of Modified Gravity and Primordial Non-Gaussianity in Large Scale Structure Observations
• Cosmic variance mitigation in measurements of the integrated Sachs-Wolfe effect
• Is Dark Energy an Effective Manifestation of Non-equilibrium Thermodynamics? -- Insights from DESI